I just wanted to share a quick little tidbit on how to install older brew versions.

I was having some issues with an older version of Elixir failing tests (1.0.1), and the latest version (1.1.1) is working fine.

Just running brew install elixir gets latest.

To get 1.0.1 installed, I first went to the homebrew github repo, looked at the Library/Formula folder, found the elixir.rb formula to install elixir, looked in the history, found 1.0.1, and then executed the following line:

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brew install https://raw.githubusercontent.com/Homebrew/homebrew/8506ced146655c24920f3cc5b20e6bc9e6e703cc/Library/Formula/elixir.rb

That did it, I easily got 1.0.1 installed, and going back to 1.1.1 was super easy.

Hope this helps, enjoy! Cheers!