I have tried it. Unfortunately this has not solved it for me. However, I have finally converted my local account into one of the admin group, as it seems that via the UAC settings, uncontrolled installations can be limited as well.
Maybe, may I propose to include an advice directly in the manual on best running as admin group member, in case other users with local accounts face the same issue and start spend unnecessary time on this.
Thank you for your support anyway, mille grazie!