Some time ago we discussed drawback of link http://sourceforge.net/projects/avogadro/files/latest, placed on front page. It works quite fine only for Windows users.
For Unix users it always points to sources (but there are pages http://avogadro.openmolecules.net/wiki/Distribution_Packages and avogadro.openmolecules.net/wiki/Compiling_on_Linux_and_Mac_OS_X)
For Mac, sometimes binary build is not ready immediately after release, and link also points to sources without explanation
There is page http://avogadro.openmolecules.net/wiki/Get_Avogadro, but its link is not so easy to find
Solution is a smart js-enabled button, but currently it is forbidden to use JS on wiki pages