Did a little more digging, it appears Australia was the first region it was released in.
Taken from: https://www.classicdosgames.com/interviews/johnpassfield.html
Halloween Harry was published by Apogee. How did your relationship with Apogee start?
“We originally signed Halloween Harry to an Australian company called Manaccom. They had a deal with Apogee to distribute their titles in Australia (including Doom at the time) so they introduced us to Apogee. Apogee then sublicenced the game to Formgen who released it commercially.”
What I haven’t been able to find is a copy of that v1.0 with Manaccom as the publisher.
