This time, it really *is* the final patch for v1.0.
http://www.sitesled.com/members/frudaIf you don't have the pack yet, download the original pack, then get each update.
Oh yes, I almost forgot. Patch 6 drastically improves gunsounds for most of the planes (I couldn't update some planes due to lack of source material, but they had excellent gun sounds anyway), and fixes more gun sound bugs (wrong sounds for different barrel sizes).
It makes AHII a whole new experience.