I had an experience that may shed some light on the subject. I recently had to get a new machine (win 7 64 bit) I had to migrate from an XP machine. I saw an ad for PC Mover by LapLink. I sued itr to move evrything to the Win 7 machine. Needless to say some programs would not run. Auto sketch release 7 was not one of them. Opened the program and brought up several sketcches, made a changein one File it , brought it up again. I satisfied my self that the program would run on my Win 7 machine. However due to otgher programs not running and several would not uninstall I had to resort to revering my Win 7 machine to its factory conditiion and several programs would not run ion a 64 bit machine others I got updates from respective vendors.
As you found out of course Autosketch woul not even lnstall You got an error message saying that it is not compatible with a 64 bit machine. It is a puzzle how I got it run when it was "PC moved" but it will not install.
I tried to find info on Autodesk but as you I am coming up empty. I hope that Autodesk will step up to the plate and help and not gve teh pat answer of "you need an upgrade" I am sure wiser computer geeks can figure a way to get release 7 to run on a Win7 machine.