This is the #1 cause of "Crash on Load" (stuck at 30% or 80%).
If you are experiencing a specific type of crash, here is a review of the targeted fixes: koikatsu crash fix
Nothing is more frustrating than spending hours perfecting a character card, only for the game to crash to desktop (CTD) when you try to load a scene. This is the #1 cause of "Crash on
E. Missing or outdated dependencies
If you're using mods, they might be causing the crash. Try disabling or removing mods to see if the game stabilizes. right-click the game in your library
If using Steam, right-click the game in your library, go to Properties > Installed Files , and select Verify integrity of game files .