Instead of unofficial patches, use these verified methods to repair Phasmophobia :

Are you getting a or a black screen when you try to launch the game?

“The community often suggests that if you're stuck at 90% loading, try lowering your graphics settings to the absolute minimum and capping your FPS at 60 until you successfully enter a lobby.” Zendesk

: If the game crashes on startup, navigating to Steam\steamapps\common\Phasmophobia and deleting UnityPlayer.dll before verifying the files can resolve the issue.