Some notable changes in patch 1.5.97 include:
However, the USSEP team maintains a "forward-only" policy. This means the version currently on the Nexus Mods page is designed exclusively for the latest version of Skyrim (1.6.x). If you try to run the latest USSEP on Skyrim 1.5.97, the game will because the mod now requires files found only in the Anniversary Edition. How to Get the 1.5.97 Compatible Patch unofficial skyrim special edition patch 1.5.97