I have no copies of the mission.
Yes, there were many iterations of KotS posted/attached to the thread here at one time. Blackie, did you empty the trash can?
Hopefully there is still one viable version left, but it likely only exists on a backup of the old subscription-server. I think Vander did mention copying over all the old mission files before we stopped that server.
I believe WaxWorks also went by the handle Jack Ferrell (or similar) so you might want to see if an account exists under that name over at RoF forum and elsewhere. I think he also was flying IL2 BoS at least in the beginning, so try there as well.
As mentioned to you in PM, it is his intellectual property. If you've made the effort to track him down and he is not around anymore, I think you would be fine running the mission as long as you completely acknowledge his authorship.