I've been using 4.02 without any issues for quite a while. However, I'm sure the folks at
Black Aces will recommend their 3.06 one-click installer. I haven't really tried multi-player on 4.02 but I think that MP is more stable on 3.06. If I didn't already have a stable 4.02 installation, I would choose 3.06. And at some point in the future, if I found myself with enough time to enjoy this sim and try MP, I may attempt to revert to 3.06.
Wizard