Hey @pstoric,
Have you also trying disabling UAC from the registry? https://community.microfocus.com/adtd/sws-qc/f/itrc-895/285431/alm-support-tip-how-to-disable-uac-fr...
For example, with Windows 2008 R2 this was a requirement even if you disabled the UAC from the GUI. It is worth to give it a try.
Remember to reboot.