: You can force Steam to download the 1.10.163 files by using the Steam Console ( Win + R , then type steam://open/console ) and running download_depot commands for the specific manifest IDs associated with that version.
: You must use the "Pre-Next Gen" version of the Address Library to allow other mods to function.
Do NOT use the standard "Verify Integrity of Game Files" option in the Steam properties menu if you have downgraded. Steam will see your 1.10.163 files as "outdated" and force-update you back to the latest version.
Ensure the game client matches the latest server-side requirements for Bethesda.net services.
Use the download_depot command with specific IDs for version 1.10.163 to fetch the legacy executable and game data.