Hi,
Blizzard does not support external drive… or non-NTFS drives. Here’s 2 posts to that effect:
- 1st paragraph of : Blizzard.net Desktop App Not Downloading Any Games - #2 by Skelgarer
- Game seems to be stuck on waiting on another update - #2 by Caterpepi - Technical Support - Diablo 3 Forums
Do you have enough space on internal, NTFS formatted, drives to move these games ?