Unable to activate Windows Store app (Visual Studio 2015, Windows 10 Version 1511)

Question

Today I updated my Windows 10 PC to Threshold 2. The update went fine apart from Visual Studio refusing to run any of my Universal Windows 10 projects (including new ones).<

Answer 1

Since correct answer does not work for me, I found another bad solution: change your package name for debugging purposes.

Important: you should stop debugging via stop button, not via App`s close button.