Very old Graphix Advantage 6.0 discs needed

I have a client with a very old Windows 98 PC and he had Gerber Graphix Advantage 6.0 installed but had hard drive problems and doesn't have the original discs anymore which were stiffy discs I assume. He does have 2 Rainbow LPT dongle's, Sentinel SuperPro and Sentinel C-Plus B. Does any one have or know where can we find the software?
I have downloaded and installed Gerber Omega Version 2.2 which was the oldest I could find from the Gerber website, but it doesn't want to install on Windows 98. It installs on XP but XP doesn't recognize the Rainbow dongles.