Yesterday, Hawk released a very powerful tool for keeping your maps up to date with full automatical support. It is even able to fix a messed up mapinstallation and you have the possibility to manage your maps by installing/uninstalling them individually.
You can find this tool in the downloadarea of the GS-Clan:
If you check for updates it should ask you to update your HD2 Map Sync tool. When you have updated the application and then go to download, it will ask you if you wish to replace your maplist of leave it alone.