Perform sfc/scannow in command prompt
uninstall the browser via iobit uninstaller, perform a restart of your PC and then install the brave browser again
Instead of using brave.com for downloading the setup file, try installing an older version for testing
see here
Once installed, brave will auto update to Latest version
if the browser still crashes, it just means you haven’t turned off other apps/themes properly like i said in my previous response which could be the reason why your brave browser is crashing.