R/bindingofisaac: The official subreddit for Edmund McMillen's Zelda-inspired roguelike, The Binding of Isaac! Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts. I have tried manually adding a mods folder, and sticking mods in it. Go to your install folders and you will see a folder called 'mods' in there. The Binding of Isaac: Afterbirth is the massively updated expansion to 2014's roguelike of the year, The Binding of Isaac: Rebirth. By manually installing mods on the PC, you can keep earning achievements and unlocks in The Binding of Isaac: Afterbirth+. Here's how it works.
Features:
- Modlist with Priority management
- Automatic Installation path finder ! (Steam users only)
- One click Install / Remove Mods
- Mod version display
- Save and load your favorite Mods as Modpacks!
- Modding helper function
- Start the game directly after installing mods !
- Customizable UI
- Convert '.unknown' files to normal ones
How to use
Start the .exe file.
Select the Isaac installation path.
Press 'Add mod' to add a mod, or place a .zip/.rar file into the 'Mods' folder next to the 'Mod loader.exe' (created automatically after first start.)
Mods that are higher up in the list, will override other mods, if they use the same files.
To install all mods, Press 'Install mods'.
To remove all installed mods, press 'Remove all installed mods'.
Attention
You need Microsoft .NET framework 4.5.2 or Higher to use this mod.
Mac Users:
You need the program 'Mono' to execute this tool. Install the program and follow the official 'Mono' instructions on how to execute .exe files.
This Tool supports .zip and .rar files for both Rebirth and Afterbirth mods.
Problem solving:
How to properly point out an error:
Read the Error message. if you dont know what it means, copy the whole message and post it as a comment.If no error occurs but something is correctly installed or behaves weird, enable debug mode and run the tasks that created the bug/error.
Example: Enable debug, Load modpack 2, remove installed mods, install mods.
after you finished upload the latest Debug file somewhere and post the link as a comment. you can upload those files easily on www.Pastebin.com
The software throws an error. what now ?
Read: 'How to properly point out an error'
The software needs Permission for something.
Try executing the software as an administrator and close all applications, that currently have access to the isaac folder (the game, modding tools, etc.)
The software does not support mod X. make it work!
Read: 'How to properly point out an error'
Virus scan:
How To Install Binding Of Isaac Mods (for Mac) Free
https://www.virustotal.com/de/file/b52320e2c8a98d959edb6dd2be982209033f064a3bfea16defbcc5a790f2a125/analysis/1458591189/SHA 256- Code: b52320e2c8a98d959edb6dd2be982209033f064a3bfea16defbcc5a790f2a125
- ---------- Changes in Version 2.6:
- Added Function to Convert .Unknown Files into Normal readable ones!
- You can now scroll though your mod list ;)
- The program will now warn you, if you want to install mods while there are still mods installed
- ---------- Changes in Version 2.5.1:
- Fixed bug that cause the game to not launch correctly
- ---------- Changes in Version 2.5:
- Improved automatic isaac installation path finder. Now finds alternative steam libaries, too.
- You can now launch the game trought the program!
- Changed add/remove mod buttons to look more appealing
- Isaac installation path subpanel will now no longer be displayed after finding a legitimate installation path
- now displays number of overriden files after installation
- ---------- Changes in Version 2.4:
- You can now create Modpacks that allow you to load an arrangement of mods.
- You can now generate an empty Folderstructure that allows you create mods without having to generate the needed folders by hand.
- ---------- Changes in Version 2.5:
- Improved automatic isaac installation path finder. Now finds alternative steam libaries, too.
- You can now launch the game trough the program!
- Changed add/remove mod buttons to look more appealing
- Isaac installation path sub-panel will no longer be displayed after finding a legitimate installation path
- now displays number of overriden files after installation
- ---------- Changes in Version 2.4:
- You can now create Modpacks that allow you to load an arrangement of mods.
- You can now generate an empty Folderstructure that allows you create mods without having to generate the needed folders by hand.
- ---------- Changes in Version 2.4:
- You can now create Modpacks that allow you to load an arrangement of mods.
- You can now load Folders as mods aswell !
- You can now generate an empty Folderstructure that allows you create mods without having to generate the needed folders by hand.
- Updated Screenshots
- ---------- Changes in Version 2.3:
- Bug fixes that prevents Capital letter files/folders from being deleted.
- Bug fixes that fixes a wrong installation of some mods (Example: charge-up-bars V 1.9)
- Bug fixes that caused crashes when mods had the same name
- improved performance
- Now allows you to create Log files for Debugging :)
- ---------- Changes in Version 2.3:
- Fixed Bug that prevents Capital letter files/folders from being deleted.
- Fixed Bug that fixes a wrong installation of some mods (Example: charge-up-bars V 1.9)
- Fixed Bug that caused crashes when mods had the same name
- improved performance
- Now allows you to create Log files for Debugging purposes :)
- ---------- Changes in Version 2.2:
- Priority queue works now in the intended way (Higher entries override lower entries, not wise versa)
- Priority order will now be stored after closing the tool!
- Added 'Help'-Tab and moved some Help buttons into that
- Added 'About'
- Added Progressbar for displaying the installation status
- You can now maximize the Software
- You can now Scroll thru the modlist, if to many mods are loaded
- Fixed minor bugs
- ---------- Changes in Version 2.0:
- config.ini files will no longer be deleted.
- Removed mods will now be relocated in the recycle bin rather than completly deleted.
- 'Thumbs.db' files will no longer be installed (useless mac files).
- You can now add/remove multiple mods simultaniously
- !!! NOW SUPPORTS .RAR FILES !!!
- !!! now ignores additional folder-structures like XXX.rar/MYMOD/resources/... !!!
- > no more .zip file editing required!
- ---------- Changes in Version 2.1:
- now ignores readme and .bak files
- performance improvement for installing mods
- added option panel for some options
- -- Deleteing disables mods / moving them to recycle bin
- -- Select / deselect all mods
- Selected options and the installation path will now be saved even after you closed/reopened the program
- Rearanged the layout to make things easier to read.
- Fixed bug with loading mods placed in Mods folder.
- Fixed bug with adding existing mods
- Fixed bug with loading mods that have 2 root folders abouth the mod files (e.g. XXX.zip/MYMOD/resources/...)
- ---------- Changes in Version 2.0:
- config.ini files will no longer be deleted.
- Removed mods will now be relocated in the recycle bin rather than completly deleted.
- 'Thumbs.db' files will no longer be installed (useless mac files).
- You can now add/remove multiple mods simultaniously
- !!! NOW SUPPORTS .RAR FILES !!!
- !!! now ignores additional folder-structures like XXX.rar/MYMOD/resources/... !!!
- > no more .zip file editing required!
- config.ini files will no longer be deleted.
- Removed mods will now be relocated in the recycle bin rather than completly deleted.
- 'Thumbs.db' files will no longer be installed (useless mac files).
- You can now add/remove multiple mods simultaniously
- !!! NOW SUPPORTS .RAR FILES !!!
- !!! now ignores additional folder-structures like XXX.rar/MYMOD/resources/... !!!
- > no more .zip file editing required!
- config.ini files will no longer be deleted.
- Removed mods will now be relocated in the recycle bin rather than completly deleted.
- 'Thumbs.db' files will no longer be installed (useless mac files).
- You can now add/remove multiple mods simultaniously
- !!! NOW SUPPORTS .RAR FILES !!!
- !!! now ignores additional folder-structures like XXX.rar/MYMOD/resources/...
- > no more .zip file editing required!
- config.ini files will no longer be deleted.
- Removed mods will now be relocated in the recycle bin rather than completly deleted.
- 'Thumbs.db' files will no longer be installed (useless mac files).
- You can now add/remove multiple mods simultaniously
- !!! NOW SUPPORTS .RAR FILES !!!
- !!! now ignores additional folder-structures like XXX.rar/MYMOD/resources/...
- > no more .zip file editing required!
- config.ini files will no longer be deleted.
- Removed mods will now be relocated in the recycle bin rather than completly deleted.
- 'Thumbs.db' files will no longer be installed (useless mac files).
- You can now add/remove multiple mods simultaniously
- !!! NOW SUPPORTS .RAR FILES !!!
- !!! now ignores additional folder-structures like XXX.rar/MYMOD/resources/...
- > no more .zip file editing required!
- Changelog of version 1.3:
- Added checkboxes next to modnames to enable/disable the installation of certain mods.
- Checked & unchecked state will be saved even after you close the program!
- Changelog of version 1.2:
- You can no longer edit the isaac installation path (security reasons)
- added pop up window for successfull mod deinstallation
- Added help button next to the 'Add' / 'Remove mod' Buttons
- You can no longer edit the isaac installation path (security reasons)
- added pop up window for successfull mod deinstallation
- Added help button next to the 'Add' / 'Remove mod' Buttons
- fixed bug that allows you to install mods outside of the isaac installation folder.
good loader
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.IO.FileNotFoundException: Could not load file or assembly 'SharpCompress, Version=0.10.3.0, Culture=neutral, PublicKeyToken=beaf6f427e128133' or one of its dependencies. The system cannot find the file specified.
File name: 'SharpCompress, Version=0.10.3.0, Culture=neutral, PublicKeyToken=beaf6f427e128133'
at Mod_Loader.ModLoader.buttonInstallMods_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLMSoftwareMicrosoftFusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLMSoftwareMicrosoftFusion!EnableLog].
************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3260.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
Mod Loader
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///C:/Program%20Files%20(x86)/Steam/steamapps/common/The%20Binding%20of%20Isaac%20Rebirth/Mod%20Loader.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3260.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3314.0 built by: NET472REL1LAST_B
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3190.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
Microsoft.VisualBasic
Assembly Version: 10.0.0.0
Win32 Version: 14.7.3190.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3190.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3260.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3190.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
keep getting this error
OS: Microsoft Windows NT 6.2.9200.0
Recycle: true
launchingState: nothing
Installation Path: c:program files (x86)steamsteamappscommonThe Binding of Isaac Rebirthresources
---- Modlist:
0: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModsChargeup Bars v2 - Rebirth_##_1.0.zip
1: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModschud-mod_##_14.zip
2: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModsearthbound-music-mod_##_1.0.zip
3: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModsexperience-bar_##_1.0.zip
4: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModsingame-graphics-character-menu-dlc_##_1.2.1.zip
5: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModspulled-teeth_##_1.0.zip
6: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModsshop-donation-machine-farm_##_1.0.zip
7: C:Program Files (x86)SteamsteamappscommonThe Binding of Isaac RebirthModsskymod_##_1.0.zip
debug
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.NotSupportedException: Unknown header: 1263534083
at SharpCompress.Common.Zip.ZipHeaderFactory.ReadHeader(UInt32 headerBytes, BinaryReader reader)
at SharpCompress.Common.Zip.StreamingZipHeaderFactory.d__0.MoveNext()
at SharpCompress.Reader.Zip.ZipReader.d__0.MoveNext()
at SharpCompress.Reader.AbstractReader`2.NextEntryForCurrentStream()
at SharpCompress.Reader.AbstractReader`2.MoveToNextEntry()
at Mod_Loader.ModLoader.buttonInstallMods_Click(Object sender, EventArgs e) in D:WorkspaceMod LoaderMod LoaderForm1.cs:line 448
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1648.0 built by: NETFXREL3STAGE
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
Mod Loader
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///C:/Users/lmelt/Desktop/Mod%20Loader.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1586.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1647.0 built by: NETFXREL3STAGE
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1586.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
Microsoft.VisualBasic
Assembly Version: 10.0.0.0
Win32 Version: 14.6.1586.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1647.0 built by: NETFXREL3STAGE
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1586.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.6.1586.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
SharpCompress
Assembly Version: 0.10.3.0
Win32 Version: 0.10.3.0
CodeBase: file:///C:/Users/lmelt/Desktop/SharpCompress.DLL
----------------------------------------
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
Any help?
NOTE: I do not know whether to use Mono the app from mono-project.com, or to use Homebrew's mono available for brew.
For this demostration, I used the app.
(System.UnauthorizedAccessException: Access to the path 'c:program files (x86)steamsteamappscommonThe Binding of Isaac Rebirthresourcesmusic' is denied.)
> mono 'Mod Loader.exe'
Unhandled Exception:
System.TypeLoadException: Could not load type 'Mod_Loader.ModLoader' from assembly 'Mod Loader, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
- Add the ability to update a modpack, like if I add a mod to a modpack, currently I have to delete it and recreate it with the same name.
- Change the UI to create/load modpacks, I think removing the dropdowns would be a huge improvement, like just add the ability to go Modpacks > Load > {my modpack} instead of having to go through the dropdown
- Make modpacks remember the order of the mods, currently it's reset every time you load one
Apart from that huge props, amazing tool, saves me a huge amount of time
Which is weird because both mods have the same folder organization in their .zip, so I'm guessing this may be how SML behaves in case of conflict but in that case couldn't it simply merge the two instead of leaving one out? Heretic only changes like 2 or 3 items.
Comments to the points:
1. thats a good idea
2. that idea is good,too but c#`s folderbrowerdialog is shitty, it would still look like a dropdown list.
3. theoretically, that should already be the case. can you enable the debug function and paste the log onto pastebin for me ?
4. (EID X Heretic ) same as 3. please post log to pastebin and i will take a look at it
EID not being unpacked correctly: https://gist.github.com/Anahkiasen/70ddc5c44eca12859b7f94f9d9f33bad
Ask and you shall receive.
Windows cannot find 'C:Userscamer_000Downloadssimple-mod-loader_2.6(1)Mod Loader.exe'. Make sure you typed the name correctly, and then try again
have you tried to execute the program in a different folder?
have you tried running it with admin rights / made an exception for anti virus ?
after executing, are there still all 5 files in the folder or are some missing/ new ones ?
yes
no
yes
the .exe is missing
ps plz help
Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item' end Quote. I wen't into properties and clicked the run as administrator to see if that would work but it didn't. if you could look into this and hopefully fix it and let me know that would be great
Thanks -Bored Guy
Disable Avast Shield Controls to fix.
For the people that the game was to hard(including me :P )
Change all the items rooms (+ In the greed mode) with better and more items!
To instal just go in this file:
Extract the rar file that you got and put the folder hire
ThisPC>OS(C>Program Files>Steam>common>The binding of Isaac Reberth>resources
And here you go!!!!
TO INSTALL IT FOR AFTERBIRTH+
For those who think this mod is great but cannot work with afterbirth+, here is how you can solve this problem
Also, this approach do not prevent you from getting achievements unlike other lua-mods.
Background: since Isaac now is reading the files in the folder 'packed', any mod you put in the folder 'resources' will fail.
steps:
1, go to 'SteamsteamappscommonThe Binding of Isaac RebirthtoolsResourceExtractor'
2, run 'ResourceExtractor.exe' and press Enter, wait until it unpacks all stuff, then press Enter again.
3, go to 'SteamsteamappscommonThe Binding of Isaac Rebirthresources'
4, there is a folder named 'packed', change its name to whatever you want as long as it is not 'packed'.
5, you will see a folder named 'rooms'. Great, same name with the folder in 'better-item-rooms_1.2.3.zip'.
6, unzip 'better-item-rooms_1.2.3.zip', replace the original folder 'rooms' with your mod folder 'rooms'.
7, Done and enjoy.
just remind, this approach works with many mods which simply replace files.
Show less...
Thx SpicySticksJanuary for the distractions!!!
FOR MAC
1) Download the mod.
2) Open up the Appstore and download Extractor. (This will convert the file to one your Mac can read.)
3) Open up Finder and press command-shift-G, type in '~/Library/Application Support/Steam/steamapps/common/ and press enter.
4) Click on the 'The Binding Isaac (etc)' folder, then right click the game icon and click on 'show package contents'.
5) Click on 'contents', 'resources', 'resources'.
6) Find the mod in your downloads and drag it into this folder, make sure NOT to put it in the 'packed' folder.
7) If anything else is required to get the mod to work, the modder will have made a note of it, hopefully.
It's my first mod!!!
Comment me if you want something more!!!!!
Hope you like it!
How To Install Binding Of Isaac Mods (for Mac) 2
- I make the file .zip because some of you have trouble trying to download .rar :)
Modding Of Isaac
I would appreciate it so much.
2) Open up the Appstore and download Extractor. (This will convert the file to one your Mac can read.)
3) Open up Finder and press command-shift-G, type in '~/Library/Application Support/Steam/steamapps/common/ and press enter.
4) Click on the 'The Binding Isaac (etc)' folder, then right click the game icon and click on 'show package contents'.
5) Click on 'contents', 'resources', 'resources'.
6) Find the mod in your downloads and drag it into this folder, make sure NOT to put it in the 'packed' folder.
7) If anything else is required to get the mod to work, the modder will have made a note of it, hopefully.