My story starts same as here Qt 5.6 VS 2015 problem
I have installed this
And tried it using this extension on VS
https://visualstudiogallery.msdn.microsoft.com/c89ff880-8509-47a4-a262-e4fa07168408
I've faced the same problem as described in that question. And the answer solved my problem as well.
But now I have another error. I've searched on the net but couldn't find anything related to. By now, QT path in Qt Add-in is set. Every time I click 'Open .pro project' it tells me
The following error occurred:
The default Qt version does not support Visual Studio 2015.
In order to import .pro files specify a Qt version >=5.2 as default.