Just did a GOG survey that focused on the idea of a paid membership option on GOG. Seems they're determining what people would be willing to pay extra for. Some of the options were
- a tool for backing up offline installers
- ability to install previous versions of a game
- extra insight into the preservation work they're doing.
- voting rights on games to bring into the preservation program.
And others that I can't remember.
That's not an official/proper feature on steam, there's nothing in the interface to select an older version, right? Just the beta system that lets developers have multiple branches available, which is often used to keep a limited number of previous versions available.
I thought it was a command that you could launch steam with that would give you access to older versions. I'm sure I have done that when trying to mod GTA and it needed a particular version.
Ah, seems you're partially correct - steam has a command for downloading a specific depot version. You need to know the specific ID to download, and notably games can use multiple depots to form the game files, but I thought you needed to use something like SteamCMD or DepotDownloader for that.
I'm still upholding the fact that it's not a "proper" feature, while I appreciate having those kind of utilities put in the user's control, this isn't something most people could figure out themselves.