Game update prompt while playing 09/15/19?

This was at 12:45 EST US - I had just beaten Mouthpiece and paused the game. I was then prompted to exit the game for an update.
I declined because I wanted to grab my loot before exiting. Once I quit out I couldn’t/can’t find the update anywhere.
I checked Microsoft, in the game itself, my Game & Apps, nothing.
Did anyone else experience this tonight?

got it as well yesterday but could not find it either after declining

Edit:
Just got it today first time starting the game. Accepted it and was returned to the title screen and … nothing else. Epic!