Here’s how to find the correct file for game version 1.6.640 (the "16640 link"):
The number 16640 is the last five digits of the full version number for Skyrim Special Edition executable ( SkyrimSE.exe ). After Bethesda released the "Anniversary Edition" update in November 2021, the game’s version jumped from 1.5.97 to 1.6.xx. The specific build is commonly referred to as 16640 in modding shorthand. skse 16640 link