The new Numbers app is not backwards compatible with the old app. If you are not running Mavericks on your Mac Pro, then you most likely can't run the new Numbers App on your Mac Pro (or is it a MacBook Pro as yoru signature indictes?).
I have just tried and the old version of Numbers for the Mac (v2.3) will not open a spreadsheet updated by v3.0 of the Numbers app, so you will need to revert your iOS device to an older version of numbers, or upgrade your Mac Pro (or is it a MacBook Pro?) to Mavericks so you can load the new version of Numbers.