[Lakota]

jantot
I had the same problem as you did when I first try to
install the 4.1 patch. After 5 times, I decided to dl the
4.1 to my desktop. From my desktop I double click the
4.1 exec and it installed the patch correctly. I then
started the game and all the planes were there.
So try dl the 4.1 patch to your desktop

You are not the only one either:
viewtopic.php?t=23514