The following error message is received when upgrading Plesk:
"Error 1920. Service 'DrWebCom' failed to start. Verify that you have sufficient privileges to start system services"
The reason of the problem is that " DrWebCom " service is missing for some reason.
Run cmd.exe and execute the following command to create the DrWebCom service:
sc create DrWebCom binpath= "C:\\Program Files\\SWsoft\\Plesk\\DrWeb\\drwebcom.exe"
Then either click "Retry" to continue upgrade or start it again if you canceled it before.
Note: Services mmc snap-in should be closed during performing any operations with "sc" command.