My iPad also is stuck on 10.3.3 as it won't update due to hardware antiquity.
i have automatic upgrade turned on for my apps, and Now TV updated itself last evening ( Sunday 25 Nov 2019) .
since then I can only display " my tv" and if I click any menus it crashes immediately .
this is obviously a software error at Now TVs end , and needs sorting asap .
Because iPads are so reliable, there are many many users out there still stuck on iOS 10.3.3 .
as soon as you can Now TV ........
They already know about it, believe me 😤