GF Version 2.8, released 8 July 2007; updated 12 September. The Sourceforge GF site has currently only v 2.7 and older versions.

Don't forget that you can always get the current sources from the GF Darcs Repository. First time you do

  darcs get --partial --set-scripts-executable http://www.cs.chalmers.se/Cs/Research/Language-technology/darcs/GF/
and subsequent times
  darcs pull -a
Then compile and install as described in GF/src/INSTALL.