That didn't work either. Still, I appreciate the effort to try and fix it

Well now I feel dumb. One of the comments said I need to own "the game" and assumed that meant opposing force. Please excuse my stupidity

I tried following both of the tutorials and with both methods I get this error when I try to launch the BAT file. I own the game on steam and had steam open while trying to run the file. I uninstalled and reinstalled both the game and the file packs. I don't know what to do.