To resolve the issue of the Talkie app showing as "invalid," follow these structured steps:

1. Check the App Installation:
- Ensure that the Talkie app is correctly installed on your device.
- If you see an error that the app package is invalid, it may be necessary to uninstall and then reinstall the app to fix any corruption in the installation.

2. Reinstall the App:
- Uninstall: Locate the Talkie app on your device, press and hold its icon, and select “Uninstall” or “Remove App.”
- Reinstall: Visit the official app store on your device, search for "Talkie," and install the latest version of the app.

3. Check for Updates:
- Ensure that your operating system (OS X 10.15.7) is compatible with the latest version of the Talkie app. Sometimes, outdated operating systems can cause issues with app functionalities.
- Go to your Mac App Store and check for any available updates.

4. Clear Cache and Data (if applicable):
- If you previously logged in to the app, clearing the app’s data might help. Check the app settings or preferences for an option related to clearing data. This option is more common on mobile versions, but worth checking if applicable for your system.

5. Check Network Settings:
- Since the app may require internet connectivity, ensure your network connection is strong. Disconnect and reconnect to your Wi-Fi or cellular data.
- Restart your router if necessary.

6. Read Community Feedback:
- Engage in user forums or Reddit threads related to Talkie, as these platforms often provide troubleshooting useful insights from other users who may have faced similar issues. Here’s a relevant discussion: Will these issues ever be fixed? - [learn more].

7. Seek Video Tutorials:
- Consider watching video tutorials that guide through common troubleshooting steps for the Talkie app. For instance, this YouTube video provides a comprehensive approach: how to fix Talkie app not working - [learn more].

8. Contact Support:
- If the issue persists after performing the above steps, contact Talkie's customer support for further assistance. They may provide specialized help or information about known issues with the app.

Following these steps should help to resolve the issue of the Talkie app being labeled as "invalid." If you encounter further challenges, it may be worthwhile to stay updated through community forums for the latest information or fixes.