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2 Base package

ModAPI v1
deprecated
Version 1.0.5 (build 20181007)
ModAPI v2 Version ModAPI v2.0.9622 (2026-08-08)
  • timeline
    ModAPI v1 Changelog
    ModAPI v2 Changelog

    GitHub Repository

    # ModAPI v2.0.9622

    ## v2.0.9622 Summary of Major Changes

    ## Fixed an issue related to the double checksum calculation method
    - ModAPI_Shared\Data\Game.cs — Changed the CheckSumGame field from protected to public
    - ModAPI\Windows\MainWindow.xaml.cs — Removed the logic to recalculate the checksum separately using FileValidator.ComputeAssemblyChecksum() in the game startup integrity check, and changed it so that the Game.CheckSumGame value, which has already been correctly calculated, is reused in GenerateCheckSums().

    ### Issue
    The integrity check (FileValidator.ComputeAssemblyChecksum()) was designed to always calculate the checksum for only two files (Assembly-CSharp.dll + Assembly-CSharp-firstpass.dll). While Green Hell (two file systems) happened to work correctly, games like The Forest that link four files (firstpass + body + UnityScript-firstpass + UnityScript) always failed the integrity check because the checksum numbers did not match, even though the game files themselves were valid.

    ### Fixes
    The checksum calculation logic has been consolidated into a single `Game.GenerateCheckSums()` function. Since this function follows the list of files required for each game (VersionsData.CheckFiles), it always calculates accurately for all games regardless of the number of files (2, 4, etc.). Additionally, deprecated folder path estimation logic has been removed (including code that replaced the `.Replace()` function, which was already problematic).

    ### Affected Games
    The Forest (4 file systems - resolved immediately) and all future games using similar multi-file checksum systems (structurally prevented from recurring).

  • info_outline We do not support cracked games.
  • info_outline Do not overwrite your existing v1 installation with v2.

3 Select popular mods to add to your package

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4 Download your package

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Downloading YUMI...

1 Your download is ready!

Extract the .zip file to
C:/Program Files (x86)/
Or choose another location. Do not extract it inside the Steam game folder.

2 Start YUMI.exe and follow the installation steps.

3 Select the game path
(e.g. Steamkeyboard_arrow_rightSteamAppskeyboard_arrow_rightcommonkeyboard_arrow_rightSons Of The Forest)

4 Start the game through Steam

If you later add mods, just restart YUMI and it will automatically install them.

FAQ

Download

Downloading ModAPI...

1 Your download is ready!

Extract the .zip file to
C:/Program Files (x86)/
Or choose another location. Do not extract it inside the Steam game folder.

2 Start ModAPI.exe

3 Enable mods

4 Start the game

You can launch your game regularly through Steam without ModAPI after the first launch.

FAQ