Download it from the navcoder web site and install it, most of it will allow free use, only some things require you to register (and pay).

Clicky

If you are asking where to get a fully functioning copy "free" then I don't know (I'm happy to pay Jochen for his effort).

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.