Per my friendly RedM serverer and developer, this is what you do,

Open the CitizenFX.ini file in your “RedM Application Data” folder.

Change “SavedBuildNumber” to the number you need. Avoid 1311.

Example:
[Game]
IVPath=C:\Program Files\Rockstar Games\Red Dead Redemption 2
SavedBuildNumber=1436
UpdateChannel=production

This hasn’t changed but as the server and clients release updates, you may run into issues. Make sure you keep an eye out on the forums for updates so that you can keep everything synced up with the most recent working builds.

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