I imagine you're talking about this forum page:
http://549.rapidforum.com/topic=1024...nd%2Caus%2Cdem
Considering the thread is nearly 4 years old, I'd say the software that was linked is long gone due to just routine cleaning of old/unused files off the Servers.
...I very HIGHLY DOUBT it's gone classified. If the tanks had gone mainstream and there was potential for money to be made then yes. But that was hardly the case with these very niche tanks.
If you're truly concerned and uncomfortable about sharing though, I would certainly suggest trying to get in contact with the original programmer to get his blessing...But I'd imagine he's probably long gone as well (but I see you're fairly active on that Forum too, so you'd know better than i!
)