Download the latest version of the from its official GitHub or community guide page.

Your Koikatsu game directory must NOT contain any Chinese characters, spaces, or special symbols.

Koikatsu can consume massive amounts of RAM and VRAM, especially with high-resolution mods.

Run the installer. It will automatically detect your old files, overwrite broken plugins, and clean out obsolete scripts causing character maker errors. 4. Fix Crashing on Loading Screens (Card-Related Crashes)

Under the tab, click Settings under the Performance section.

Ultimate Koikatsu Crash Fix Guide: How to Stop Crashing on Launch and Gameplay

Move all files out of your UserData/chara/female folder into a temporary desktop folder. Move them back in small batches (e.g., 20 at a time).