If you're encountering the "Origin is not installed" error, try the following solutions:

Open your downloaded repack folder (where the setup files are). Look for a folder named , CODEX , PLAZA , or Files .

to disable all non-Microsoft services and restart your computer to ensure no background app is blocking the game. Windows Update

Paste them directly into your main FIFA 21 installation directory, choosing if prompted. Prevention Tips for Future Repacks