Unofficial Skyrim Special Edition Patch (USSEP) for version 1.5.97 Feature: The "No Req" plugin system.
The "No Req" Plugin System & Backwards Compatibility
Use Vortex, Mod Organizer 2, or another mod manager to install the mod. Alternatively, you can manually extract the files to your Skyrim Data folder. Unofficial Skyrim Special Edition Patch 1.5.97
Without the USSEP, a heavily modded Skyrim is a house of cards. With it, the game becomes stable, predictable, and playable. Bethesda has even acknowledged that many fixes in official updates were derived from the USSEP.
To ensure a stable mod setup, your load order in your mod manager must place the essential master files and USSEP correctly. You should follow this order from top to bottom: Unofficial Skyrim Special Edition Patch (USSEP) for version
"Fishing" or "Survival" mode messages appear (if using Best of Both Worlds).
The patch aims to resolve thousands of bugs left unaddressed by Bethesda, ranging from major quest blockers to minor visual inconsistencies. Bethesda.net Quest Stability: Without the USSEP, a heavily modded Skyrim is
Corrected broken skill perks that either failed to calculate bonuses properly or caused unintended stat loops.
Modern mods often require Backported Extended ESL Support to run on 1.5.97 Why Modders Stay on Version 1.5.97
You can try to manually backport USSEP changes, but that’s advanced. Easier: find older versions of those mods or stay on AE.