Skyrim Skse 1.6.640 [repack] Now

: Most legacy mods work without issue, and newer mods often still provide "backward compatible" versions for 1.6.640 because so many players refuse to update to the buggier 1.6.1170. Ease of Maintenance

To get your modded game running on this version, you must match the extender version exactly to your executable's build. skyrim skse 1.6.640