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@Cindy6875 You wouldn't be able to play with the new content, but gta5 doesn't have that much story content added. However, with the game updating itself no you wouldn't have to manually downgrade every time, you could do what I do. I would recommend making a copy of GTA downgrading the copy and launch through its directory by launching the GTA5.EXE and your main directory that's not the copy would be the up-to-date version of the game that way you can switch between the 2 versions of the game and not have to worry about downgrading every time you wanna play with his trainer. If You do this make sure you downgrade the COPY version and also you can turn off auto updating in steam settings. unfortunately, No one can upgrade his trainer to the newest version of the game due to his files not being open sourced. All we can do is hope Mr Zolika comes back to the gta community. Possibly will come back for gta 6 whenever it releases. Hope this helps if not Sorry friend.