How can I cancel the installtion of a update

[QuoxNET]

We have the same Problems during the Update to the new Version of Plesk and fixed it through using the command "/usr/local/psa/admin/bin/websrvmng -a" and killed all services and restarted all again manuelly.

Now under Server -> Updater I have this ERROR:

Server > Plesk Updater

Warnung: Fehler: Autoinstaller busy.
Warnung: Installation läuft.

How can I restart the installation or canceling the installation?