Hi there! I’m Emily, happy to help get your Magic Jigsaw Puzzles app working on your Mac.

To clarify, when you say the app won’t open, do you see any error messages or does it just fail to launch? Also, did the app ever open successfully on this device before? Knowing this will help me guide you better.

Meanwhile, here are some simple steps you can try to resolve the issue:

1. Restart Your Mac: Sometimes a quick restart can clear temporary glitches that stop apps from opening.

2. Update the App: Make sure Magic Jigsaw Puzzles is updated to the latest version available in the App Store. Sometimes older versions might conflict with macOS updates.

3. Reinstall the App:
- Quit the app completely if it’s running in the background (you can right-click its icon on the dock and choose Quit).
- Move Magic Jigsaw Puzzles to the Trash.
- Empty the Trash.
- Re-download it fresh from the App Store.

4. Check for macOS Updates: Your macOS 10.15.7 is Catalina, which is still supported, but ensure no pending system updates could improve app compatibility.

5. Remove App Preferences:
There could be corrupted preference files causing this. To reset those:
- Go to Finder.
- Press Cmd+Shift+G and enter ~/Library/Preferences/.
- Find any files with “magic” or “jigsaw” in the name and move them to the Trash.
- Try launching the app again.

If none of these work, there might be a deeper compatibility issue or corrupted data causing the app not to open. In that case, I can guide you with more advanced troubleshooting.

Let me know what you tried and any additional info you see when trying to open the app!

Are you satisfied with the solution I provided so far?