VICTORY!
I figured out what the problem was. In the Resource.cfg I had:
PackedFile ../../../Users/YourName/DOCUME~1/ELECTR~1/THESIM~1/DCCache/*.dbc
But I didn't even replace the stupid "YourName" part because I'm an idiot. So instead I went back and put in:
PackedFile Mods/Packages/*.dbc
PackedFile Mods/Packages/*/*.dbc
And it worked! Now I have all my precious content. Thank you a millions times witch.