Once downloaded, you will have a .7z archive file. Extract it using a program like 7-Zip or WinRar. Open the extracted folder; you will find several .dll and .exe files, as well as a Data folder.
If you intentionally downgraded your game to keep an older modlist stable, you must scroll down to the Silverlock archived builds section and download SKSE64 2.1.5 (for 1.6.353) or SKSE64 2.2.3 (for 1.6.640). Step-by-Step Installation Guide skse for skyrim 1147 2021
The Version Conundrum: Clearing Up the "1147" and "2021" Confusion Once downloaded, you will have a