usualy this branch builds are not written for upgrade, and maybe do not work at all.... Intended to test on new installations (sometimes nor virtual machines) Noone i think has tried, and discovered out how to... usually is far far better new clean installation, (back ups of all that u need is a walk in the park..) SO think to back-up all and make a new install Suggest so...
Upgrade was the first thing i tried and no luck. a fresh install is better anyway. Just back up your essential data and happy testing. I burned everything i needed along with a couple back up OSs I have a windows 7 sp1 precracked along with a live ubuntu cd in case mistakes are made and files need to be replaced manually instead of reinstalling.