Yeah, I remember using Stuffit back in the day. Unfortunately, it's way outdated now and doesn't support modern compression formats like .7z or .zipx. I'd recommend switching to something like Keka or The Unarchiver for macOS instead.
lol, what's the nostalgia? Stuffit Deluxe 11 is like from the Stone Age! Did you guys find a working download link for this ancient app or is it just a trip down memory lane?