Also keep in mind that patch 1.07 and patch 1.08 are really big ones.
Novarezo: I think install size of 1.08 is about 5,5GB, but download size was for me only about 2GB.
You don't use Galaxy I guess. The patch you can download from your library is packed but the files Galaxy is downloading aren't packed (if you don't use the backup option from more button for a later install). This results in a size difference.
So first big download for glasssigh was patch 1.07. Next was patch 1.08. And the last big download are the extras Galaxy want to download without you really want it (disable auto-update will help).