Homebrew does not keep older versions for all of their packages. Elixir is one of those where there aren’t older versions. You can look for older packages like this: brew search [packagename]. If there are older versions, they’ll pop up.

So for change the version it’s needed to use a manager?
I already have installed with brew and for use diferent versions I install right now the asdf.
It’s very simple this manager and I liked.
My question is, I need to uninstall the elixir and Erlang with homebrew?
Or just keep them? Because I know it’s a lot capacity keep them.

Thanks folks, I’ll give a shot at kiex then.

What specifically you couldn’t make work with asdf? Theoretically this is the best option as it compiles OTP from source.

I didn’t intend to disparage asdf, I’m just not a user of it at present so there are likely some familiarity gaps. The tests kept failing after installing older Elixir versions, which in retrospect may have been happening because I didn’t have the correct/compatible versions of Erlang installed (the test failure output didn’t help point me in any useful direction, unfortunately). I couldn’t find a way to skip the tests, which seemed to abort the whole install when they fail. Even after I did get an install to pass (1.16 I think, only one that worked) and added some incantations to my .bashrc, the elixir command would do nothing, no output, not even “command not found.” I’m sure this was due to some form of user error, but after trying out kiex no problems like these appeared, and I was up and running in a couple minutes. At a certain point the time for troubleshooting is up, and the path of least resistance is what you need to run with.

I’d be happy to try all this again and open a github issue or two (for anything that doesn’t prove to be user error) if that’s helpful at all.