If you crash in the Character Maker, lower your resolution or disable "Anti-aliasing" in the startup launcher.
Koikatsu is a 32-bit application by default (even on 64-bit systems). This means it can only use unless you patch it. koikatsu crash fix
A stable Koikatsu is a maintained Koikatsu. To avoid needing a "koikatsu crash fix" ever again, follow three golden rules: If you crash in the Character Maker, lower