How to Downgrade or Change the Version of a Game
https://steamcommunity.com/sharedfiles/filedetails/?id=2353930763
WEBJan 7, 2021 · Go to SteamDB [steamdb.info] and search for your game. The first ID you will need is the app ID, which can be found on the game page. Make sure that you get the AppID of the game not the DLCs' or …
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