The current patch is 1.50
Do you have Northern strike as well?
If so then the patch process is
1.25,
Northern Strike,
1.25 again,
1.40 then,
1.50
otherwise you will get the "Unmodified Content Error" when trying to play NS.
Dont forget seeing as your an old fart like us you can join TOG officially and still be part of AvA and then join us on TeamSpeak so you dont get lonely whenever your playing 2142.
Hope this all helps
