The latest version of fpTEX can be found on every CTAN site in the systems/win32/fptex directory, for example:
ftp://ftp.dante.de/pub/tex/systems/win32/fptex/0.4
ftp://ftp.tex.ac.uk/pub/tex/systems/win32/fptex/0.4
will point you to the current release.
The home of fpTEX is:
You can find beta versions as well as goodies and news here. The main repository for the files is ftp://ftp.dante.de/pub/fptex .
For a very quick installation, follow these instructions:
An easy alternate solution is to get the TEX-Live 5 CD-ROM. You will get everything from the CD-ROM, maybe not as up-to-date, but maybe more easily.