David Paul wrote on Jul 19^th, 2015 at 10:09am:

For those with issues, are you installing as Administrator?

Confirmed. I redid the whole process just to make sure (I usually do, but couldn't swear to it the first time...). Still borked for me.  >:(

I've gone back to 2.4 yet again. I then realized that I only tried one of the 727-100 variations. Have you tested all three external variations?