GOG.com is another option if you want to avoid patch problems, with a caveat: I'm talking about when you dowload the files yourself, not using the Galaxy installer. When there was an issue with one of the patches I literally just went into my folder and deleted it. Granted I have luck of the far realms but another things is if you use this method you can dowload the original release files and add only patches you want.
Use Steam DB man..
Its the Only Way to Roll Back they are not releasing The Beta Old Patchs for us to Roll Back.
(but Use Steam DB at your Own Risk Man.. if yu dont know How, best to not even Try.. yu could do Big Shit if yu mess something.)