C:\Users\username\AppData\Roaming\7thWorkshop
Did you go there and delete the old catalog.xml?
Also, you need to click on Workshop -> Check subscriptions now to register it into that catalog.xml file. Or, it will register it automatically the next time you open 7H.
EDIT: I've moved this to its own topic, as it doesn't pertain to any kind of Mod Request or Mod Update.