UMAROMC I was wondering why MU had OS 10.5 listed as a requirement since the description of this update states "BETTER Leopard Support..." rather than "Made SPECIFICALLY for Leopard" but it looks like they did their homework. After rummaging through the developer's site I found, indeed, that the [OS] requirement is 10.5.6 where earlier versions of Leopard "may work".
(Version 2.03)