Hi Frank Land;
Ages ago when I first decided to get use Adobe products, I started off with demo software. When my real software finally arrived I deleted the demo software and then attempted to install the new. Nothing would install at all. I called Adobe support and their solution was to send me new media which worked as well as the original, not at all.
Finally on the Adobe forum one of the user there suggested a script that goes through your system and removes all of the bit and pieces that Adobe has installed throughout your system. Once I ran the script, everything installed like a champ.
This was a very long time ago and I can no longer find the script on my system. Maybe if you go to the Adobe forums and ask around for cleanup script that same user might be able to help you also.
Allan