When hub 3.0 was in beta , I had a try to upgrade beta3 to beta7. But only black screen . OK,I guess it just because of beta. So i downgrade to 2.x. Everything is good. we cool here. But today, hub3 finally release. that's what I got. Boom When I trying to downgrade to v2 as usual, I found I can't find where I can get v2 installation. hub3.0 really piss me off.