Last version of Map Install for PPC Mac's and a Down Load Link

Yes I know OLD SCHOOL!!! But Still using a OLD Power Mac!! G-4. When My wife went to do a update on her Gps! She started up Map install and said a software update! So She did it!!! Now of course map install does not work. because it is for intel I know there was a Newer version then came with the disk of Topo USA. and that version is giving problems when I now try to update the maps on her Dakota 20. Help! Thanks if possible. :confused: