To download SKSE (Skyrim Script Extender) for Skyrim version 1.6.640
Note: This is the folder containing SkyrimSE.exe, NOT the Data folder. : Copy the contents of the Data/Scripts folder from the SKSE archive into your game's Data/Scripts : From now on, you launch the game using skse64_loader.exe to enable script extension. Verification skse 16640 link
Now that you have the right link and knowledge, go forth and mod Skyrim safely. Remember: check versions, read mod descriptions, and keep SKSE updated. To download SKSE (Skyrim Script Extender) for Skyrim
Current latest (as of 2025): SKSE 2.2.6 works perfectly with game version 1.6.640. Current latest (as of 2025): SKSE 2
Alternative (Nexus Mods): You can also find this version in the "Old Files" section of the Skyrim Script Extender (SKSE64) Nexus page. How to Install
The correct version of Skyrim Script Extender (SKSE64) for game version 1.6.640 is 2.2.3.