That also includes the Black Tree Gaming folder in your 'C://User/Local/. uninstall Nexus, then delete every folder that involves Nexus MM.
The easiest way is simply to locate the 'Skyrim' folder in your Steamapps folder and delete it, then have steam reinstall the game, updates and. Sorry if y'all figured it out but if you CTRL Click on the mods one by one it highlights them and brings up a little white bar on the lower part.
The recent post can work but it takes too long, click on the mod at the top of your page, hold shift then select the mod at the bottom of the page so all of your mods are selected, then hit the delete key which is very top right of your main keyboard, not the backspace one. How to Use Nexus Mod Manager to Download, Install, Remove, and Manage Mods - LevelSkip