Hi there! I see your CBS app won’t open on your Mac running OS X 10.15.7. Let’s work through this together.

Can you tell me if you see any error messages at all when you try to open the app? Also, have you tried any steps already, like restarting your Mac or updating the app?

In the meantime, here are some troubleshooting steps you can try:

1. Force Quit the CBS app if it seems stuck:
- Click the Apple menu (top left corner).
- Choose "Force Quit…"
- Select CBS app from the list if it’s there and click "Force Quit."

2. Restart your Mac:
- Sometimes simply restarting clears temporary glitches.

3. Check for updates:
- Open the App Store on your Mac.
- Click Updates on the left.
- See if there’s a CBS app update available and install it.

4. Reinstall the CBS app:
- Open the Applications folder.
- Find CBS app and move it to Trash.
- Empty Trash.
- Re-download CBS app from the official source or App Store to ensure the latest version.

5. Check your internet connection:
- The app needs a reliable connection to open successfully.
- Try loading a website or streaming something else to confirm your internet is working.

Since you're on a Mac, if CBS app is a web version you’re accessing via a browser, try clearing your browser cache or try a different browser.

If the app still won’t open after these steps, please let me know any changes or new messages you notice, and we can dig deeper.

Are you okay to try these and update me?