But this is the kind of error message I like since it tells me exactly what’s wrong: ‘…ERROR: Remnant files exist in the GAC, please remove and re-run the installation script...’ and on top of it, how to remedy it:
To remove these files it is necessary to quit out of the Powershell.
Then manually restart the (Internet Information Services) (net start w3svc or II
Remnant files found...
Stopping both services went fine (from an elevated cmd prompt!) but locating the file Microsoft.EnterpriseManagement.SharePointIntegration.DLL in folder C:\Windows\Assembly wasn’t a success.
Now it was easy to remove that file, restarted both services I stopped earlier and reinstalled the Operations Manager Web Part as documented. Now the deployment run without any issues at all.