On the files.. I think I found the storage for the “installed” ones… If you’re using Windows, check your user’s AppData folder (If I remember, before 10 You could find this easily in the same directory as the Documents… which it is in 10, too, but you have to go through your root directory->Users->(username). In the AppData, look in the Roaming folder for Blender Foundation->Blender->2.80->datafiles->studiolights->world. If you delete it from there, I think it will “uninstall”.
