I have a fresh install of Server 2012 R2 and I downloaded the latest SUU and wrote it to a USB Flash Drive.
When I run it, I get the splash screen, but that's it. It stays there forever and never proceeds to the program itself.
Does SUU not run from USB drives? Should I copy the entire flash drive (8.6GB) to the hard drive of the server and run it? The ISO is too big for a DVD.
I don't know if there is a software limitation preventing it from running from USB, but given the size, I can understand it being slow. I would certainly put the ISO on the server and run it directly from the drives.