Having issues downloading and accessing 1.6.3 version

So I have the Leonardo and was attempting to download the 1.6.3 version(and was prompted to delete the older version which i did) but when i got a prompt that said something like the 1.6.3 version was incomplete check with publisher or writer. So i attempted to download the older version back onto my computer and it works fine...any suggestions??

Thank you

The current version os 1.6.4. Click on the Download link at the top of this page and try installing that.