Skse 16640 Link Info

If you see an error saying you are running game version 1.6.1170 but need 1.6.640, Steam likely auto-updated your game. You will either need to download the latest SKSE version (3.0.x+) or use the Skyrim Special Edition Downgrade Patcher on Nexus Mods to go back to 1.6.640.

Many modders intentionally "backport" or freeze their game at 1.6.640. This is because the transition from 1.6.640 to 1.6.1130 involved significant changes to the way the game handles plugins (the "Marketplace" update). skse 16640 link

From now on, do not launch Skyrim through Steam. You must run skse64_loader.exe to start the game with mod support. Why version 1.6.640 is a "Golden Build" If you see an error saying you are running game version 1