Go to https://dev.acquia.com/downloads and download a release for your operating system.

Run the installer:

If you can’t open it by double-click, right-click it and select open.

Select Open again:

Use the default settings and finish the installation.

Select start from scratch to add a new site:

You will be offered bunch of distributions, select the official release:

Leave the default settings and select Finish:

Navigate to the site address to finish the installation: http://drupal-8-3-0.dd:8083:

Read more about the installation process here: /drupal/8/installation/mamp/.

And there you go: