The "SKSE Plugin Loader: DLL plugins you have installed require a new version" error is a common roadblock for Skyrim modders, typically appearing after a game update. This message indicates a between your Skyrim executable, the Skyrim Script Extender (SKSE), and the DLL-based mods you have installed . Why This Error Occurs
Once you identify the .dll file, you need to find which mod it belongs to and update it. skse plugin loader dll plugins require new version
Are you seeing a in that error message, or did this happen immediately after a Steam update ? The "SKSE Plugin Loader: DLL plugins you have