Hello EisnerMarkus, Hertzie,
I seem to remember that a friend of mine way back had copies of these packages.
They were published by Abacus. (no real surprise there!)
If these were the packages that you are using, I believe that some of them were new models that were not available as freeware and were pretty good for the standards of the time. Others look like they were derived from ones that were freeware but since they were modified, Abacus probably contracted with the authors to do the modifications. (This last part is a guess.)
I personally was not that interested in the packages because by then, I was building my own models (using Abacus Aircraft Factory 99) and figured I could probably do as well if I set my mind to it.
There were also the missions, but I never actually tried those because I simply don't have a habit of flying packaged missions at all.
- Ivan.