Provided your Brave browser version is the same as mine at the time of writing (83.1.10.93) – if not, substitute the numbers – quit the browser and do the following:
1. Launch the Terminal
2. Type this: cd /Applications/Brave\ Browser.app/Contents/Frameworks/Brave\ Browser\ Framework.framework/Versions/83.1.10.93/Frameworks/Sparkle.framework/Versions/A/Resources/
3. Then this: mv Autoupdate.app/ Autoupdate.app.OLD
4. Open Brave, go to the three-stripe “burger” menu and select About Brave, you should be able to see the following message:
Update failed (error: 11)
Error details:
An error occurred in retrieving update information. Please try again later.
5. Quit the terminal, you’re done