I have HOMMV (and all expansions) on an internal slave drive on my computer with Windows 7 and it says, whenever I try to patch it, that it's not installed. Any help would be awesome. Thanks, all!
Did you try to update with the US version? Because I had the same problem only finding out that I had bought the European Collectors Edition and not the US edition. Try patching it with the EU Collectors updates and see if that works.