Can you actually not download it, or is it just that you need more space to install it (they are two separate actions that Home does one after the other).
I'm assuming this is a new GB/Ireland map for your 520?
If it's now too large for the internal memory, you'll need to buy an SD card to put the new map onto.
EDIT: But a new UK map is only about 230MB!
Were you trying to fit a full Europe map on a regional model? You'll definitely need an SD card.
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