Hi selfdestruktor,
Work on the old Spotkin version of Contraption Maker which included the installer stopped a few years - probably not long after Jeff (or maybe Peter) got you the key. Updates have been for the Steam version and also recently the Epic and Good Old Games versions. Right now I'm the only person working on it so my free time is very low - jumping between current projects, adding things when I can to Contraption Maker, and regular life/family stuff (I really need to stain the deck this summer).
Anyway, you can contact me at: kevin@topm.com Maybe I can figure out something that'll work for you.
Kevin