I stopped by this evening and stumbled upon this thread https://www.airgunnation.com/threads/updated-chairgun-packages-now-available.1305881/ , and I was able to successfully download this new revised version of Chairgun Pro that I lost when my hard drive crashed a few months ago. I always loved playing with Chairgun Program and was sorely disappointed about losing it...God Bless all the folks involved in making it available once again! 
All the best, Chuckster636
www.airgunnation.com
All the best, Chuckster636
Updated ChairGun packages now available.
ChairGun-USE A new "User Supported Edition" of ChairGun Pro, updated to operate on modern devices, and extended to run on MacOS, Windows and Linux, is now available for those of you who are having trouble running it on your modern devices. If you already have the Original Developer’s edition...
www.airgunnation.com