I have installed this
And tried it using this extension on VS
https://visualstudiogallery.msdn.microsoft.com/c89ff880-8509-47a4-a262-e4fa07168408
The extension detects the Qt version (5.6) but will give this error
This Qt version uses an unsupported makefile generator (used: MSVC.NETMSBUILD, supported: MSVC.NET, MSBUILD)
Is there any workaround?
The problem seems to be a bug in the extension that concatenates the MAKEFILE_GENERATOR settings.
You might try the following workaround: In QT5.6.0\5.6\msvc2015\mkspecs\common\msvc-desktop.conf line 14 should read: MAKEFILE_GENERATOR = MSVC.NET
After commenting out this line, I was able to add QT Version 5.6.0 via QT5->Options->QT Versions->Add without problem
Everything worked fine after that.
Test it as well , i have already asked the Qt guys they said that the updated version of Qt addin for vs2015 will be out with the release version of qt 5.6.
i quess they don't care about vs2015 that much since they got their own tool to advertise (qtcreator)
The problem is caused by this change https://codereview.qt-project.org/#/c/124917/ which synchronizes settings between classic and WinRT applications.
The workaround I found is in C:\Qt\Qt5.6.0\5.6\msvc2015\mkspecs\common\msvc-desktop.conf. Qt 5.6.0 splits all the version-specific changes into a separate file msvc-base.conf. If you copy the contents of this file and replace the line "include(msvc- base.conf)" in mscv-desktop.conf then Qt5Package recognises the Qt 5.6.0 Beta with no problems.
Note this still needs to be fixed in Qt5Package.
来源：https://stackoverflow.com/questions/34405207/qt-5-6-beta-visual-studio-2015