Even on Windows 10 or 11, Koikatsu often requires legacy DirectX files to run the engine properly.
Add your Koikatsu installation folder to your Antivirus . koikatsu crash fix
Delete the BepInEx/config folder (back it up first) and restart the game to let it regenerate default settings. 2. Check for Plugin Conflicts Even on Windows 10 or 11, Koikatsu often
Disable "Real-time Protection" temporarily to see if the game launches without it. Even on Windows 10 or 11
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