Did you register? This needs to be done first, then update. The servers refuse you if they are busy. Try it in the morning or later this evening and it might work.
You can also download the files from links on this site and update from a usb stick.
Not sure where the link and instructions are, maybe someone will post it soon. I will snoop a little to.
edit: here is a thread for future referrence:
https://www.mobileread.com/forums/sho...ownload+ermine
Be sure to get the right one when you download there are two entourage edges, the 10 inch and the pocket usually designated EE and PE.