Right click on the game -> Properties -> Game versions and beta -> Select beta It will come on the main branch in a couple of days, but if you're in a hurry you can already test it out on the beta branch.
I'm still hoping for steamcloud or something I still haven't uninstalled it, I don't fully trusst back up saves yet, I think I missunderstood something once and haven't noticed it yet if it worked correctly for me or something.
