Windows UAC timeout in elevated operation causes problems

Windows UAC has two minute timeout and if that happens, installer is unable to proceed and will most likely fail either to finish installation (user needs to start from scratch) or finish update (installation is corrupted and user needs to start from scratch).

This can happen quite easily, since the installation might take an hour and the UAC dialog is shown almost at the end when installing Boot2Qt content.

User is given a fallback solution, but without possibility to copy&paste the command, it's almost useless.

Cannot get authorization that is needed for continuing the installation.
Either abort the installation or use the fallback solution by running

C:/Users/sapiippo/Downloads/qt-unified-testclient-windows-x86-3.0.0-online_180.exe --startserver PRODUCTION,{57abbb75-c6d0-4ebf-a586-e7be0b86ac5f},{9fed7b44-28c4-4a3f-95d8-ffaada42e4fe}

as a user with the appropriate rights and then clicking OK.