Unarc all this shit to diskettes.  Where ARC files are within ARC files,
create a subdirectory with the same name and put the files there.  In
the case of the PDOS-SYS.ARC file the whole thing is in one subdirectory
named PARADOX2.

Insert PDOXINST disk, go to your default drive <presume c:> and type

        a:install3 c:

The rest is history.