I think you can get some of the earlier versions on the
official AppCAD download website.
Form thier site:
The AppCAD Story
The Application Engineering
staff of the Microwave Semiconductor Division of
Hewlett-Packard Co. created AppCAD as a design help for RF
& Microwave ("wireless") designers. AppCAD was then, and
still is, distributed free of charge as a service to the
wireless engineering community. (The Microwave
Semiconductor Division later merged with a different
division of HP, all of which has since become part of
AppCAD was originally
released in 1990 as version 1.02 (the "Classic" version).
Version 1.02 was a DOS program that was compatible with
Although based on the original
MS-DOS® version of RF and Microwave AppCAD "Classic," the
current version of Agilent Technologies' AppCAD runs on
32-bit Windows® operating systems and contains many new
and innovative design programs.
Click on the
AppCAD Classic link.