Visual Studio 2015 installer hangs during install?

Question

I downloaded the full ISO for Visual Studio Ultimate CTP 6. The installation program got to about the 90% mark, gauging by the progress bar, and just stuck there. There wa

Answer 1

For Windows10:

1) Kill VS2015 Process if hung

2) Disable Windows Defender

3) Open VS2015 as Administrator

4) Enable Windows Defender

5) Initial VS2015 startup is complete