All downloads are always available from http://code.google.com/p/fastlz/downloads/list.
As for now, stable version is not available yet. Please come back again soon.
Alternatively, use the development version (see below).
Development version can be checked out from the Subversion repository.
For command-line subversion client, use the following command:
svn checkout http://fastlz.googlecode.com/svn/trunk/ fastlz
After that, see instructions on how to compile it or read file README.TXT.
Note that the development version is considered unstable and may contain bugs. Please be careful when using it.