Try running the game thru it's 'normal' launcher. 4GB Patcher makes it where launching it normally--or thru Steam--Automatically activates the Script Extender. You can test to see if NVSE is running by typing the console command "getnvseversion" without the "quotation marks". And try going into Votex Settings and Hit the Switch on Archive Invalidation to Uninstall and Reinstall it. Tried this Master fix yet? https://www.nexusmods.com/newvegas/mods/61357?tab=description Try the Optional Pathfixing mod on this one; NOT the Pink Faces fix for FCO (unless you get Pink Faces) https://www.nexusmods.com/newvegas/mods/63230?tab=files I managed to get FCO to work with this guide, alongside FNV Redesigned 3; you'll have to download and read the text folder. https://www.nexusmods.com/newvegas/mods/64600?tab=description I didn't follow the very last step, but it still worked. This newer FNV Redesigned Mod might make it a little easier. https://www.nexusmods.com/newvegas/mods/65865 If you ever decide to give up on FCO, and try FNV Redesigned 3; it only requires the Old 2.3.1 version of FCO. And use this Mod: https://www.nexusmods.com/newvegas/mods/65865