Just a quick question, is it only possible to play OA while being logged in "Live" - thus having to create a new game if I only played offline till now, and must I stay online all the time? Sounds nasty ...
Actually no.
It downloads the files to the Live folder but if you move them to the Fallout 3 data folder you can play it offline.
Found out about that after browsing the forums as a lot of modders use FOSE and FOMM which only work offline