Problem upgrading from 2.8.0 to 2.8.1

Hi
When i try to downlod the 2.8.1 update I get this error message in the update log. Any suggestions what to do?

CDownloadUpdatesDlg: Failed to download updates. Cause: Error downloading update(s):
Could not recognize the ZENworks Mobile Management version number. Please contact Tech Support.

regerds
mikael