Ok, here's the FastPath software I promised:
(what an odd trick of fate that *I* would be doing this; yee gods! How
come no asks for gatorbox software? :-)
http://www.heeltoe.com/download/shiva/FastPath/
download/shiva/FastPath/shiva-ftp/distrib/fastpath/9.2/NewFeatures.txt
download/shiva/FastPath/shiva-ftp/distrib/fastpath/9.2/fp92.sea.bin
I can't say what runs in a FP-4 vs a FP-5, sorry. You might start with
the 8.1.1 on a FP-4.
Also, in case it's not obvious I'd use something like "unstuffit" to
deal with the .sea.bin files.
-brad