Hi there! I see you're having trouble with the Artbook app not loading on your Macintosh running OS X 10.15.7. To help get this sorted out, could you tell me a bit more? For example, does the app fail to open at all, or does it open but then freeze or crash? Also, have you noticed any error messages?

Once you share a little more detail, I can guide you through some steps to get it working again.

App not opening at all

Thanks for letting me know the Artbook app won’t open at all on your Mac. Let’s try a few things to get it up and running again.

1. Restart Your Mac
Sometimes a simple restart can clear up any temporary glitches. Have you tried restarting your Mac since this started happening?

2. Check for Updates
Even if you think the app is up to date, it's good to double-check the App Store for any pending updates for Artbook or your macOS. Outdated software can block apps from launching.

3. Force Quit and Reopen
If the app seems stuck in the background:
- Click the Apple menu and select “Force Quit.”
- Look for Artbook in the list, select it, then click “Force Quit.”
- Try opening the app again.

4. Delete and Reinstall the App
Since the app does not open at all, uninstalling and reinstalling it can clear corrupted files or settings.
- Drag the Artbook app from your Applications folder to the Trash.
- Empty the Trash.
- Go to the App Store and download Artbook again.

5. Check for Conflicting Software or Permissions
Occasionally, security settings or other apps interfere with app launches.
- Go to System Preferences > Security & Privacy > Privacy tab, and check if Artbook has necessary permissions like “Files and Folders” or “Accessibility.”
- Try temporarily disabling any antivirus software to test if it’s causing the issue.

If after trying these steps the app still won’t open, please let me know if you see any error messages or behaviors when you attempt to launch it. That info will help me narrow down the problem further.

Are you okay to try these steps and share what happens?