We have deprecated Brave Muon in favor of this:
I highly recommend you install the new build and enjoy a much better browsing experience.
It runs in parallel with the Muon version you have installed now, so you don’t have to uninstall or overwrite anything and you can even import data from your previous Brave install into the new build.
This is why there are “two” Braves. You may also be interested in reading this:
And maybe this too:
Are you attempting to update from Muon (v0.25.2, as we just learned) or Brave Core builds? Are you using these Terminal instructions?