winrar is a compression decompression utility like winzip-
Unrar what you downloaded-- inside the rared files you'll find a file ,the unlocked GMAPSUPP, you can place it in your Garmin directory on GPS internal memory or in an sd- the name must be gmapsupp.img(Garmin image file- not linux-) if it's the only one you have, or gmapsup2.img if it's the second one, always in a Garmin directory



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