: Ensure your Nemesis installation is within the Skyrim Data folder. If you use Mod Organizer 2 (MO2) or Vortex , ensure the executable path is set correctly to the one inside your game directory.
Check "Run this program in compatibility mode for" and select Run the tool again and try the "Update Engine" button. 2. Check for Antivirus Interference Add the Nemesis
If you recently switched from Vortex to MO2 or have leftover deployment files, Nemesis might be getting confused by "managed" markers. Add the Nemesis
Add your to your Antivirus exclusion list. Add the Nemesis.exe itself as an exclusion. Add the Nemesis