Hi Both, I have exactly the same problem. I tried to re-install the previous version also but received the same 'offline activation' page.
It must be there activation server, I have submitted a support request which is normally responded too within hours, still waiting.
If it was not for piracy and some ripping off others livelihoods all this would not be required, but for now it is and I am willing to be patient whilst they fix the issue.
I am sure they are busy working to fix the issue as Bert says. I feel its worth the wait as the aircraft is fun to fly and so very detailed however, my round the world trip is halted until the 414 comes back out of maintenance hanger :)