City Navigator Europe 2021.10 NT FID 8356

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Does not make any sense ! what device, why use out of date maps.
It's hard for someone to first find old versions & second a waste of storage space & time to upload .
Give us more information & lets see if we can help you.

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Garmin Express updates are linked to your device looks like your device does NOT have free Lifetime Updates.
Go to

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and download a suitable map set that fits your device for the region you require. The whole of Europe is bigger than 4Gb. now

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For Example Western Europe

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Yes Garmin Express offers the latest map available to that specific device ,it is not necessarily the latest as your newer device confirms.
You don't need anyone to re upload City Navigator Europe 2021.10 NT as you have access to from your Street Pilot c510 all you have to do is

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, but why install old maps when you can choose a regional map that is current.

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Garmin Express gives a device with limited storage (older devices) & lifetime map updates options to choose a region as Europe NT has out grown most older devices.
Tell us what other devices you have as it seems you have everything to update to the latest Europe NT maps very easily

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For your nuvi 760 & SP c510.
On an SD card formatted FAT 32 create a folder called Garmin ,copy the unlocked gmappsupp.img file to it

Garmin\gmappsupp.img

All devices show the paths & names required in the garmindevice.xml
<Name>SupplementalMaps</Name>
<File>
<Specification>
<Identifier>IMG</Identifier>

</Specification>

<Location>
<Path>Garmin</Path>
<BaseName>gmapsupp</BaseName>
<FileExtension>img</File