The version I played was Apple 2, but I believe it was also available on Commodore and a few other systems.
I played the shit out of the demo game (there was a really fun Revolutionary War part of it), and played with making my own sci-fi campaign. I also tried Rivers of Light, which I sucked at, and the Return of Hercules, which I also sucked at.
I don’t like facebook but there’s this:
https://www.facebook.com/AdventureCreationKit/posts/the-official-adventure-construction-set-fan-club-not-the-first-one-of-course-but/516473481699604/
A couple of people discussed creating fan sites here:
https://www.mobygames.com/game/991/stuart-smiths-adventure-construction-set/
…but they are all dead links now.
Maybe a community could be created for those here on the fediverse? Post propagation added to the ability of crossposting also allows some level of preservation, so the contents are preserved if the original links die.
…though for shared user-made campaigns, incentivizing the creator to preserve the files on Internet Archive, torrent / other P2P file sharing services, some form of ActivityPub protocol for file sharing if there is one, etc., may be recommended.