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For Mac OSX users here is how to create a World Map from respective 351.zip, 352.zip, 353.zip, 354.zip and 355.zip with thanks to Chan1102, mistererikus and especially ovikovi
For use at your own risk whilst Nokia Maploader for Mac application continues to fail with the infamous 1b0.cdt File couldn't be uploaded , I might add after deleting your existing map data and wasting your bandwidth downloading new maps which you can't utilise to add insult to injury.
After downloading respective .zip files through links by ovikovi if using Safari in Mac probably to be found in "Downloads". You can leave them here (need to alter source in this case) or to follow instructions exactly drag them to "Documents" folder and unzip each here, giving you folders 351, 352, 353, 354 & 355.
Click on Finder > File > New Folder - give it name WorldMap.
For those unfamiliar with Terminal in Mac Snow Leopard ( Finder > Go > Utilities > Terminal) I suggest that you open this screenshot MergeWorldMaps and keep to hand as "spaces" are critical in Unix.
Type after $ prompt cd Documents <hit return>
Type after $ prompt cp -r 351/* WorldMaps <hit return> nothing appears to be happening as running in background but returns to $ prompt after command completed.
Repeat with cp -r 352/* WorldMaps as per terminal screenshot and so forth until complete.
You now have WorldMaps folder with contents folders 0 - 9, a - f as here