1, Delete one or more cards temporarily from the My Collection in the software.
2, goto the Download tab in the software and uncheck all automatic downloading
3, close the VG software
4, open the Taskmanager and make sure the DownloadManager isn't running.
5, Goto the data folder in AppData/vghd or Appdata/roaming/vghd and delete the DLScript.cds file to stop current download list.
6, Get a second larger HD and move the cards there.
7, Check automatic download again if you want to.
8, Have fun with all the cards ;)