I've just downloaded the latest version, and when setting the SDK location something starts and then unity stays at 100% (been over 10mins now so i'm thinking it's hung)

The problem occurs always? or just the first time you set the SDK path?

Always or first time, i can't tell, first time never completed so i did a new project , imported the unity package again, set the sdk again and same thing, it goes relatively fast (importing assets step) untill the last item and then it just hangs there with unity at 75%cpu usage, had to kill it after 20mins with it hanging there.
Am happy to demo it on skype, email me at [email protected] if you're interested in a reproduction & in help debugging this remotely.
I'm using latest unity pro.

I just sent you an email.