Gen 4 v5.1 loading.kwi?

Hi folks:

I'm trying to create a hybrid 7.1 navigation dvd for my 04 prius after purchasing the new dvd and realizing it no longer has override functionality. I have my old 4.2 disc but I was hoping to get my hands on a gen 4 v5.1 loading.kwi. The ones I've seen online I believe are gen 5 and give me a "please insert correct map disc" error. Can anyone help me get my hands on a gen 4 v5.1 loading.kwi or is a gen 4 v4.2 going to be just fine?

Thanks!