A.hat.in.time.ultimate.edition.update.v20190526... Here

Multiplayer stability, sticker system refinements, and bug fixes for the newly introduced metro world.

Are you checking for compatibility with a (PC, Steam Deck, etc.)? A.Hat.in.Time.Ultimate.Edition.Update.v20190526...

Are you trying to install (like those from Steam Workshop)? sticker system refinements

The Baseball Bat weapon and various new dyes, flairs, and hats. A.Hat.in.Time.Ultimate.Edition.Update.v20190526...