Popper installation moved to another drive letter
What it means
PinUP Popper looks for the games or launch programs of its emulators on a drive letter that is not on this PC: it finds nothing there and the games may not start.
Why it happens
The installation was set up for another drive letter (a disk, a USB drive or a copy prepared elsewhere) and is now connected under a different letter; or a full copy of it exists under another letter while the original disk is unplugged.
How Pincab Toolbox detects it
In PinUP Popper's database, the scan reads the games folders and launch folders of the emulators (not the media folders). It reports this only when at least 3 of them are on a drive letter that is not on this PC and more than half of them exist under one single other letter, with the same path.
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. Partly covered, read only: PinballX and PinballY (their settings and game lists). Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends.