Here are the Text files from my nuvi 2797 which are compatible with your dezl 760:
Spoiler: Click
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I'm unsure if you mean you need the Serbian voice file also, just in case here it is:
Spoiler: Click
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You'll also likely need a basemap (if it's missing GarminExpress won't supply it): [Only registered and activated users can see links. ]

If you need other files post again requesting what you're missing.