Automatic updates, what's the limitation?

Hello, I want to know the real limitation of the automatic updates. According to NOD32 2.7 Control Center, I have v2.70.32 and want to get v2.70.39 but it seems the only option is to download the latest installer.
I'm a registered user and I renewed the license in March for one year more. I received my new user/pw on 8-March so this is not a problem with the trial version.
I have Server = <Choose automatically>
Program component update = Notify before program component upgrade.
Restart after program component upgrade = Offer computer restart if necessary.

I get virus signatures updates without problems. Since I can't see the failure on my side (the "Update now" button will tell me NOD32 is up to date), I want to ask why nod32 (registered) cannot upgrade itself between minor versions, that's 2.70.32 to 2.70.39 and instead forces me to download a 11 MB installer again and install on top of the existing version.

Thanks.

 

ESET just hasnt released the update components for the new (and minor) version.