Hi there! I understand you're having trouble with the Rumble app on your Mac not finishing loading or installing, which is preventing you from logging in or using it. I’d love to help you get this sorted out.

To start, could you tell me if this issue happens during the initial installation from the App Store, or does the app download but then get stuck when you launch it? Also, have you tried any steps already, like restarting your Mac or reinstalling the app?

In the meantime, here’s a step-by-step approach we can try together:

1. Restart Your Mac: Sometimes a simple restart can clear temporary glitches affecting app installs or launches.

2. Ensure You Have Enough Storage: Check your disk space by clicking the Apple menu > About This Mac > Storage. Lack of space can cause issues completing installs.

3. Delete Any Partial Installations:
- Open Finder, go to your Applications folder.
- If you see the Rumble app there, drag it to the Trash.
- Empty the Trash to make sure it’s fully removed.

4. Clear App Store Cache:
- Quit the App Store app.
- Open Finder, press Shift+Command+G to open “Go to Folder” and type ~/Library/Caches/com.apple.appstore/.
- Delete the contents of this folder.
- Restart your Mac again.

5. Try Installing Rumble from App Store Again:
- Open the App Store.
- Search for Rumble and attempt the installation.
- Watch the status in Launchpad or App Store’s “Purchased” section to see if it completes.

6. Check Your Internet Connection:
- Make sure your Mac is connected to a stable Wi-Fi network.
- Try loading a website or streaming a YouTube video to confirm.

7. Allow Rumble App Permissions:
- Sometimes macOS blocks app permissions needed for proper startup.
- Go to System Preferences > Security & Privacy > Privacy tab.
- Check categories like Files and Folders or Full Disk Access and add Rumble if it appears.

8. Update macOS:
- Your current macOS version (10.15.7 Catalina) is slightly older but generally compatible.
- Check for updates: Apple menu > About This Mac > Software Update.
- Sometimes app compatibility improves with updates.

If all these steps don’t help, we might consider deeper issues like corrupted user preferences or server-side problems on Rumble’s end. At that point, I can guide you on checking logs or submitting a support request to Rumble’s technical team.

Let me know what you’ve tried so far or if anything from the above helps. I’m here to assist you through the process!

Are you able to try these steps now?