The specified update file does not contain any updates.

Hi again!
Lucky me! Probably something doing wrong, but ... Did download "ZENworks_11.2.2_Update.zip", copied to server (into tmp), accessible for zenworks user, tried sui, but ... "The specified update file (/tmp/ZENworks_11.2.2_Update.zip) does not contain any updates.". File Roller does show ... zip ok.
SLES 11, ZCM 11.2.1.
Any ideas?
More thanks, Alar.