Brave is no longer aviable at Manjaro.
Of course, there is a reason for this, which is that Brave has impossible versioning on GitHub.
I don’t have the time to find the current version out of this chaos.
There have been major problems with Brave in the past as well - we needed permission from them to deploy the browser at Manjaro.
So give Vivaldi a test - it’s more than a good replacement.
If you really want to use Brave despite everything, you can find it in the AUR: just don’t forget to activate the AUR first.