Here’s a comprehensive guide to the for game version 1.5.97 .
However, USSEP is tied to the version of the game’s master files (Update.esm, etc.). When Bethesda updates Skyrim SE —often to add Creation Club content or introduce new features—the USSEP team updates the patch accordingly. This creates a dependency: a specific USSEP version requires a specific game version. Unofficial Skyrim Special Edition Patch 1.5.97