look for the usual places (in my sig).
download UXE complete if you're looking for an all inclusive package. (even if you don't want to use that setup, it includes the xboxdash.xbe, all the fonts, nkpatcher 10 and evox)
you don't need to downgrade your dash....not anymore....ever
don't use catfish....they're ooold.....use the UXE i mentioned above