Being locked down means it won't allow any modifications of the game's scripts. SKSE will not work on any Microsoft Store or Gamepass version of Skyrim due to the fact that they are 'locked down' similar to game consoles. Most mod managers (such as Mod Organizer or Wrye Bash) support this, as does the Steam version for Skyrim LE. To benefit from SKSE's enhanced features, the game must be launched through SKSE's own loader program instead of launching Skyrim normally. The Skyrim Script Extender, or SKSE, is a third party utility that uses code injection techniques to greatly extend the capabilities of Skyrim's scripting virtual machine, as well as allowing an interface through which other mods can also further extend the engine. Pure SKSE mods, such as Immersive First Person View, and others highly. Ian Patterson, Stephen Abel, Paul Connelly, Brendan Borthwick TES V: Skyrim Special Edition (SSE) installs as a new game in Steam for those. because i already have the 'regular' SKSE for regular Skyrim, but I didnt have the dlc's so i bough special edition and now in order for me to use mods like SkyUI etc its telling me i need SKSE even tho i already have it and any links i look for to find any different versions of SKSE just take me to the 'old' one i already have.