Enjoy!
The official USSEP on Nexus Mods has moved on. It now supports only the latest Anniversary Edition (1.6.640 or newer). If you try to install the current USSEP on version 1.5.97, the game will crash on startup or warn you that the plugin is built for a newer version of the game. Unofficial Skyrim Special Edition Patch 1.5 97 Download
Because the mod author does not support older versions, version 4.2.5b is hidden from the standard "Files" tab on Nexus Mods. However, it remains hosted on Nexus servers and can be accessed via direct links: If you try to install the current USSEP on version 1
Arthmoor hosts the patch on . Older versions are sometimes linked in the forum threads. Search for “USSEP 4.2.5 download AFK Mods” and look for direct links from the mod author. Older versions are sometimes linked in the forum threads
The specific version of USSEP compatible with Skyrim 1.5.97 is .