Hey @EnZooooTM,
Are you able to check and verify the Origin library location is pointing to the correct install folder on your computer?
That option is in Origin > Application Settings > Installs & Saves.
If so, try going through these steps to clear the Origin cache and let us know if that changes anything for you.
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
Thanks for checking, @EnZooooTM.
Have you tried running Origin as an Administrator?
It may be worth setting your download location to a new folder and starting a new download there.
Once the new download has started, stop it (after a small amount of progress), close Origin, and copy the files from the old location to the new location.
Restart Origin as an Administrator and try restarting the download at the new location.
Let's see if it recognizes your installation at the new location after that point.
@EnZooooTM If you're not even able to get this installed in a different location without running into the same thing, we'll want to try digging a bit deeper.
Please try uninstalling Origin using the hard way outlined here: https://help.ea.com/en/help/origin/origin/manually-uninstalling-origin/#hard-way
Note that's different than the standard uninstallation method.
Before reinstalling everything after that point I'd try a clean boot to help make sure no other services are interfering with this whole process.
https://help.ea.com/en/help/faq/how-to-clean-boot-your-pc/
@EnZooooTM Excellent, glad to hear it! Have fun! 
devtrackers.gg