google maps nav. on g1

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I am having problems installing google maps nav. on my g1. I downloaded the navigation zip file to my desktop that contained the part 1 and 2 bat files. I am having trouble running the bat files. I cant find a really good guide to doing this. It says to extract the zip to your desktop. How do you run the bat files and what files do you put on the sd card?

i followed this thread.. pretty simple and painless and do it right on the device! hope it helps

http://forum.xda-developers.com/showthread.php?t=583684

nav on g1

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i finally got it to work. I found another thread that helped. I appreciate the advice though. Got another problem: nav works great but now i cant make a call using google voice, and my cyanogen mod was downgraded from 424 to 4231?