Huge Product Update For NAV 2012

Hi,

       I recently stumbled upon a 6 month trial of nav 2 days back and decided to install it. After the installation, the NAV auto-updated itself fully and my current version is : 19.1.1.3

 

I understand that a new version is available which is 19.7

 

However when i chose to update NAV just now, the download size is a whopping 226.3 MB.

 

Is this un-usual? If not, is there an option to select what i wish to update?