Can open Axure 9 team files in Axure 10

I upgraded from 9 to 10 today and can open version 9 files but not version 9 team files.I keep getting a message about being offline, which I am not. Clicking the ‘Try upgrading again’ link doesn’t appear to do anything at all. I’m on a mac using the intel chip version. Any advice about how to fix this would be gratefully received.