Download Stats generation is now done via mysql database.

See /cvsroot/org.eclipse:
  /www/modeling/includes/stats*.*
  /www/modeling/emf/downloads/stats.php

See also releng_test branch of /cvsroot/eclipse: 
  /org.eclipse.releng.basebuilder/plugins/org.eclipse.build.tools/scripts_cvs/searchcvs/