Version 0.1.5.1 was primarily a stability and balance patch. If you are rolling back to this version on Windows, here is what you can expect: Major Fixes
In the Steam Console, you need to enter a specific command that tells Steam exactly which game, file set, and version (manifest) to fetch. Palworld 0.1.5.1 Older Versions for Windows
: Resolved an issue where the innermost door in random dungeons would fail to open after defeating the boss. Version 0
If you own Palworld on Steam, you can technically revert to older versions using the Steam console, though Valve hides this. though Valve hides this.