So I got enterprise evaluation for windows 8.1 so i could see what windows was like and now that i realise it is worth buying i got a copy but before i got round to downloading and installing my new OS the trial ran out and this means my PC shuts down Every hour. i now cannot download my new ISO file because my internet isnt fast enough to do it in a hour. I need some way of downloading it uninterupted.... i have used SLMGR -REARM and this returns nothing and have followed countless tutorials and can no longer do anything really. any help would be apreciated!