Sometimes, Bethesda releases a new game update (like the recent "Anniversary Edition" updates), and the SKSE team takes a few days or weeks to catch up. During this gap, your mods won't work.
has updated via Steam, but your or its dependent DLL plugins have not . Why This is Happening
Navigate to your Skyrim installation folder (e.g., Steam\steamapps\common\Skyrim Special Edition ). Right-click on . Select Properties > Details tab. Note the Product Version (e.g., 1.6.1170). 2. Update SKSE