Hi! I’m Emily from Parking Jam 3D support. I see your app won’t open on your Mac running OS X 10.15.7. Thanks for reaching out! To help you best, can I ask:

- When you try to open the app, does it show any screen at all (like a loading screen or error message)?
- Have you been able to use the app successfully before, or is this the first time it won’t open?
- Have you tried any troubleshooting steps so far (like restarting your Mac or reinstalling the app)?

In the meantime, I’ll guide you through some simple steps to hopefully get the app working again.

1. Force Quit the App
- Press Cmd + Option + Esc to open the Force Quit window.
- If Parking Jam 3D is listed, select it and click “Force Quit.”
- Then, try reopening the app.

2. Restart Your Mac
- Sometimes a fresh start clears temporary glitches.
- Click the Apple menu and select “Restart.”
- After reboot, try opening the app again.

3. Check for App Updates
- Open the App Store, go to “Updates,” and ensure Parking Jam 3D is updated to the latest version compatible with OS X 10.15.7.

4. Reinstall the App
- If the app still doesn’t open, delete it by dragging Parking Jam 3D from Applications to Trash.
- Empty the Trash, then reinstall it from your original source (App Store or official website).

If these steps don’t solve it, the issue might relate to data corruption or a compatibility bug that needs advanced troubleshooting or a patch. Let me know if any error messages appear, and we can dig deeper.

Are you able to try these steps now?