title: Downgrade PHP 7.4.2. to 7.1.3, 7.2.0, 7.3.0
body: <p>During the 'Readiness Check' installing Magento 1.x , the only thing scuppering me is the PHP version check.</p>
  <p>My Mac (utilising Mamp Pro) is using PHP 7.4.2. and I need to downgrade to either PHP 7.1.3, 7.2.0 or 7.3.0.</p>
  <p>I have tried many things via the Terminal but have not managed to downgrade PHP.</p>
  <p>Can anyone point me in the right direction/offer advice?</p>