Licensing for Centrafuse 3.1 is no longer available. You can license the 3.6 product from your my account page, but we do not provide technical support for that product. If you would like to upgrade to Centrafuse version 4.4.7, please open a sales ticket and we can get you taken care of.
Centrafuse Auto no longer comes in a "navigation" version because our navigation product provider (Intrynsic) no longer makes the product and there are no maps available. We recommend using PC Navigator with Centrafuse. it has a very good plugin for integration, and there is a full-featured free version available, so total cost is $0.
Localizer is for tablet users that need to make their internal GPS/GNSS chip data available to a legacy PC navigation or mapping product. Unlike external GPS devices, most tablet GPS chips do not provide a comport for use by software, so localizer creates one and outputs the required NMEA data. Short answer: you do not need Localizer to run Centrafuse
Auto unless you plan to do it on a tablet and you want to use navigation.
if you're using a standard PC, I strongly recommend Windows 7. Other than that, all you need to do is run Centrafuse with PC Navigator and its plugin.