title: How can I downgrade Homebrew to an older version?
body: <p>Currently I have the latest version <code>2.2.17</code>, I want to downgrade to version <code>2.2.12</code>.</p>
  
  <p>Brew does not have a <code>downgrade</code> option, just an <code>upgrade</code>. Is the process to uninstall <code>brew</code> and re-install it again?</p>