Looking for Cadkey Plotfast, DOS version

I'm trying to setup a plotter on an older 486. My old 7.0 DOS install
disk is corrupted. I've looked at all my later CD's and cannot find it.
I tried the windows version from the Cadkey site, but it won't run on
the 486 for
some reason. Does anyone happen to have the old DOS version of CK
Plotfast?

Thanks,

Jon