The command line only stand alone FAHClient tarball is available for download from here.

Note: There is no install guide or support in the forum for this type of expert only installation. The only support for command-line only installs is this:

Documentation:

FAHClient --help

Configuration using config.xml:

FAHClient --configure

Configuration with no config file (minimum flags):

FAHClient --user=Anonymous --team=0 --passkey=1385yourpasskeyhere5924 --gpu=true --smp=true