Well hopefully your /root directory (/root), not just ( / ), has adeqaute space for the fp2002 upgrade script, which is actually an entire apache build script from the ground up, including php and tons of trimmings.
You can't customize this though, keep that in mind!
All you do is download the file, save it to somewhere that has ample space (make sure there are at least a couple hundred megs available on the partition in question)
and then type &chmod +x fp-5.0upgrade.sea& (filename isn't exactly that)
That makes the archive executable to you (as root hopefully)
And then, just run it like any other executable
If your server was installed with all of the prerequisites this apache build needs, you'll have the latest apache with the latest (stable) PHP, and FrontPage 2002 server extensions, not to mention a few dozen other things.