I used abdFire, but had to do it twice for some reason. 15.0 does crash for me on occasion. For now I'll ride it out. 14 was just the same till 14.2 and I'm hoping they'll come out with a bug fix soon.
I had a clean install with 15.0 on both TV and Stick. After use the config wizard, I have freezing issue with install from a zip file. I would recommend to stay with 14.2 since it work flawlessly as of now. 15.0 will work but you might have to reboot your TV or stick when she freeze. Take no more than 20 minutes with 14.2 and all the add-ons, take 45 minutes with 15.0 due to the freezing issue.