I tried to download SP2 last night but the update is stuck at "Downloading." When I try to cancel it I get:

Support Pack 2 for ZCM (10.2) - Unable to cancel this download. Please check the update status and try again.

I can delete it but when I check for updates it comes back already stuck at downloading.

I've tried importing the manual update file but it never shows up, I'm guessing because of the problem listed above.