I was missing something rather important. The author of several campaigns & scenarios I downloaded did not include the custom AI file with them.
If anyone else has this problem, load the scenario in the editor, check the name of the ai file for the computer. In the top menus, hit scenario then player data, anyway find the player data dialog. after cpu pres ai, it will list the ai used for the computer if any. Click on the ai file you want use or find the file needed and install it.
I found out I did not have the ai files in 3 and in two they forgot to set the ai for the computer in the scenario. I finally got one to run!!! Started me looking harder.
Thanx for replying mojo.
I hope this helps someone here.