Released in September 2022, version 1.6.640 gradually became the bridge. Over many months, brilliant mod developers updated almost every essential SKSE plugin—like Address Library, SkyUI, and Animation Motion Revolution—to work flawlessly with 1.6.640. It became the new, golden standard of stability for the 1.6.x generation. The Catalyst: The December 2023 Creations Update
Game crashes immediately after the Bethesda logo when launching through SKSE. skyrim special edition 16640 verified
that allow the older executable to recognize newer file headers. Standard "Verified" Content for 1.6.640 Released in September 2022, version 1
Formally, any Skyrim runtime starting with 1.6.x is treated by the modding ecosystem as "Anniversary Edition". This means that if your game version reads 1.6.640, you must download the AE version of core utilities like the Skyrim Script Extender (SKSE) and individual script-heavy .dll mods. The Catalyst: The December 2023 Creations Update Game
If you're building a new modded Skyrim setup, you can't go wrong with 1.6.640. Use the Steam console downgrade method, lock your version from updates, download SKSE64 2.2.3 and the Anniversary Edition Address Library, and you'll have a foundation that has been tested, verified, and approved by thousands of modders before you.