The booklet power up shows as enabled in my boards but isn't actually there as an option. When I try to access the website associated with the power up (https://trello.vince.run/) it has no DNS. According to Google, I last accessed it on the 21st of September. The last time I used Booklet successfully was on the 8th of October.
The power up is still showing on the Trello list so I'm hoping maybe it isn't actually gone but just suffering some sort of "oops, our domain expired and we were slow to react" sort of issue. I can't work out how to find out, though, and if I'm going to have to live without it, then I need to start looking for similar programs to achieve my current routine.
I don't suppose anyone knows anything....