If you're looking for the actual patch, I recommend searching on the official Nexus Mods website (Skyrim Special Edition section) and checking the "Old Files" tab for version 1.5.97. Always scan downloads with antivirus software and avoid unknown file-hosting sites.
Once installed correctly, your mod manager should display: Unofficial Skyrim Special Edition Patch 1.5 97 Download
You are running Skyrim SE on patch 1.5.97 and need the final compatible version of USSEP before the AE (1.6+) updates. If you're looking for the actual patch, I
The download bar crawled forward, a blue line of hope. This wasn't just a file; it was the foundation. It fixed the quests that never started, the rocks that didn't have textures, and the thousand tiny "Bethesda features" that made the game a beautiful mess. the rocks that didn't have textures