You cannot use the latest USSEP (4.3.0+) with 1.5.97. You need a legacy version.
You might ask, "Why not just use the latest USSEP?" The answer lies in dependency. The USSEP is version-locked to the game executable (SkyrimSE.exe). A USSEP built for game version 1.6.640 (AE) will crash if used with game version 1.5.97.
Here is why thousands of users choose to downgrade their game to pair with the Unofficial Skyrim Special Edition Patch 1.5.97: Unofficial Skyrim Special Edition Patch 1.5.97
While the Anniversary Edition includes dozens of Creation Club addons, the Fishing system was the headline feature developed directly into the core game update (1.5.97), accessible even to players who did not purchase the Anniversary Edition upgrade.
Feature Details:
Works with:
Does NOT work with:
If a mod requires newer USSEP:
You can try to manually backport USSEP changes, but that’s advanced. Easier: find older versions of those mods or stay on AE.
The vast library of classic Skyrim SE mods was built between 2016 and 2020. Many of these mods rely on SKSE plugins (DLLs) that were never updated for AE. Mods like .NET Script Framework (essential for crash logging and custom skills), No Grass In Objects, and SSE Fixes only work on 1.5.97. If you want these tools, you must use USSEP 1.5.97. You cannot use the latest USSEP (4
You cannot use the latest USSEP (4.3.0+) with 1.5.97. You need a legacy version.
You might ask, "Why not just use the latest USSEP?" The answer lies in dependency. The USSEP is version-locked to the game executable (SkyrimSE.exe). A USSEP built for game version 1.6.640 (AE) will crash if used with game version 1.5.97.
Here is why thousands of users choose to downgrade their game to pair with the Unofficial Skyrim Special Edition Patch 1.5.97:
While the Anniversary Edition includes dozens of Creation Club addons, the Fishing system was the headline feature developed directly into the core game update (1.5.97), accessible even to players who did not purchase the Anniversary Edition upgrade.
Feature Details:
Works with:
Does NOT work with:
If a mod requires newer USSEP:
You can try to manually backport USSEP changes, but that’s advanced. Easier: find older versions of those mods or stay on AE.
The vast library of classic Skyrim SE mods was built between 2016 and 2020. Many of these mods rely on SKSE plugins (DLLs) that were never updated for AE. Mods like .NET Script Framework (essential for crash logging and custom skills), No Grass In Objects, and SSE Fixes only work on 1.5.97. If you want these tools, you must use USSEP 1.5.97.