Tom Tom Navigator 5 upgrade

I have just received my software and as usual I tried to follow their instructions I quote " When prompted you must select the option to install the application to your storage card .Do not select the option main memory" Well it never gave me that option !!!! I recall when I bought the maps of Europe I managed to load the navigator application and the maps directly onto the card through a card reader, but I can not rememeber how I did it. I now seem to have corrupted my original Navigator card I got for my Palm T3 so am desparate to load all to a new SD card. Can anyone help as from reading Tom Toms web site and your site they probably wont reply till next year!!