I got mine from graupner.de just click on the english flag on home page. find your speedo and it should show downloads. there will be a list of software upgrades and the updater as mentioned above. did it for my GM120 a couple of weeks ago.
the software is great, but make sure you read the install notes carefully before you do anything.
also it asks to register (10 euro's) but it gives you a month to play with it first!
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