@naomi
What if I wanted to shut down the computer, to go out for the day, at the precise moment this forced upgrade kicks in? I get that you can rescedule, but for me no time is convenient because it will eat an hour or more of my time upgrading some daily-use software.
For purely selfish reasons, I'm also curious to know if you, or anyone else, lost any unwatched BBC iPlayer programmes (or other channels, also) as, sometimes, I forget the precise contents of my unwatched queue.
Mere timewasting inconveniences like this are enough of a deterrent for me. Always mañana.
Did someone say Frugsl Fred's recommendation was a data-destructive method? Advice to an audience of (self-confessed) non-experts needs to have clear warnings of the ramifications. Those will daily full backups of their precious data can dish out advice, not appreciating that others are not so well equipped and using such a strategy.