Hi! I understand the VidyoConnect app on your Mac running OS X 10.15.7 won’t stay open, and I’d be glad to help you get it working smoothly again. To start, could you tell me a bit more about what happens exactly when you try to open the app? For example, does it crash immediately, freeze, or close after a few seconds? Also, have you noticed any recent changes like updates to the app or your OS, or any error messages?

Meanwhile, here are some initial steps we can try to troubleshoot this on your Mac:

1. Force Quit and Restart the App
- Click the Apple menu in the top-left corner.
- Select "Force Quit," find VidyoConnect in the list, and force quit it if it is there.
- Try reopening the app again to see if it stays open.

2. Restart Your Mac
- Sometimes a simple restart clears temporary glitches that cause apps to close unexpectedly.
- Click the Apple menu and choose "Restart."

3. Check for Updates
- Open the App Store and go to the Updates tab to see if VidyoConnect has a newer version available. If so, update it.
- Also, ensure your Mac OS is up to date with security patches that can improve app stability.

4. Clear App Cache or Preferences
- VidyoConnect may save some settings in cache files that can get corrupted. On your Mac, those are often stored in your Library folder.
- If you're comfortable, I can guide you on how to remove these preference files to reset the app settings safely.

5. Reinstall VidyoConnect
- If none of the above works, uninstalling and reinstalling the app is a good next step.
- Drag the VidyoConnect app from the Applications folder to the Trash, then download the latest version from the official website and install it fresh.

Could you please let me know which of these steps you’ve already tried or if you see any error messages? That way, I can guide you more specifically.