>>Exactly, I wonder what could be the reason for all this.
If I had to guess I'd say that there was a SNAFU trying to apply part of the SP that needed a restart. Then when update identified and tried to apply the missing 80M piece, it had to download the whole SP to get it.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1