I have activated a trial license for IDP on my USG / Zywall.
The signatures are from 2013-12-05.
When trying to update the signatures, I get a message:
"Cannot get IDP signature URL from cloud server. (failed)"
The device will get "Fetch URL" for IDP signature update every 24 hours, just wait for one day to confirm the download issue.
If there are still issues, feel free to get in contact with us.