Make a backup of your GTA V files before following this guide.
For those who accidenttaly updated GTA V and doesn't want to wait RAGE new version support or something else.
1° - You need to open Steam with console enabled. Make a new shortcut on desktop to your Steam.exe and add -console.
e.g, "C:\Program Files (x86)\Steam\Steam.exe" -console
2°- Go to steamdb (not sure if i can post a link, google it), and search for 271590 (GTA V app id).
3°- Search in the History tab for the desire version update release date(find this by yourself).
e.g, 1.44 update was released October 16, 2018.
4°- Look for the changes wich affect /manifests/public and get their code(highlighted in green). e.g for 1.44,
5°- Go to Steam's console and type download_depot following the exemple bellow:
download_depot 271590 271591 CODE_IN_GREEN then download_depot 271590 271594 CODE_IN_GREEN
6°- Console will log where the files were saved, but they are usually saved at \Steam\steamapps\content\app_271590 .
7°- Just drop the files inside depot_271591 and depot_271594 into your GTA V directory.
That's it. I don't know if this method will work for every version, but i tried to downgrade to 1.44 and worked for me.
PT-BR