I have the same issue with both Iphone6 (verizon) and iPad Air 2 regarding the 'An error occurred downloading i OS 9 beta 2"
Will try again in a few hours!
Anyone who has downloaded via dev site have any big issues that were fixed with this update to report?
Main thing... how is battery life??
The servers are most likely getting slammed with downloads.
The battery life? It's an early beta. It it's decent at all, it's a win. Seeing minor improvement, and hearing that in general terms, it's better than beta 1.