Greetings everyone, friend of mine downloaded NA server by mistake. We want to play in EU, should she download entire game once again? Because we have very slow connection (downloading 300kb/h) and it may take 1 week
If you can connect your PC to hers you can simply copy it on to her PC, replacing the NA one or not as you choose: or you could burn in to DVD/BluRay if you have that capability.
A simply copy of the EU client tree will give her everything she needs, the ESO launcher is designed to allow for players to have both regions installed, as well as the PTS is they so choose, each client lives in its own tree under the ESO main folder.