I've compiled the installerframework with MinGW 7.3 and static Qt 5.12.0 (MinGW 7.3), 

then I've created an installer package (offline) for my application.

When I start the installer package without admin rights (64-Bit Windows 10), 

it prompts for admin rights which I then enter but the installer is not able to create the directories under "c:\Program Files", on the other hand, if I run the installer package by right clicking it and select "run as admin" then it works and installs the application correctly.

The uninstaller/maintenance tool only starts if I select "run as admin", it doesn't start if I simply click on it.