PuP-Pack in a nested folder
What it means
This PuP-Pack does not play.
Why it happens
The pack was unzipped into a folder of its own name, one level too deep. PinUP's troubleshooting page shows this exact case as wrong.
How Pincab Toolbox detects it
The pack folder holds neither screens.pup nor triggers.pup, and the folder of the same name inside it has one.
Check your own pincab
Pincab Toolbox is a free Windows scanner for Visual Pinball X and PinUP Popper. It finds and explains problems like this one. No account, no telemetry.
Download for freeCovered: Visual Pinball X (10.x) and PinUP Popper. Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends (PinballX, PinballY).