Another option :

1, Load the theme up correctly

2, Delete the Folder in this case "pack-subBlack3dblue"

3, Upload any new simpler theme and rename that theme folder ie : in this case to "pack-subBlack3dblue"

4, Your site should now be functioning with the new theme, pics might be off but at least you can get into yoursite.com/admin.php

5, Now go into Preferances and select the correct theme "subBlack3dblue"

6, Thats it, just delete "pack-subBlack3dblue" folder & your done