great white - at the top of the mega upload page you will see a box in which you have to enter the letters adjacent to the box. Once you've done that the next page will have a box with 2 columns, the right column contains a countdown timer, just wait for that to reach zero and your download will begin.

This link : BMW Navigation System FAQ will tell you all you need to know about what software updates did what. From it you will see that perspective mode was introduced with v27 on MkIV units, so when you download and update to v31 you will have it.