Automatically. Install the core package for your platform, then connect the site to your fastw3b.com account, and every add-on you are entitled to is downloaded and switched on for you. There is no per-add-on Install button, and nothing to download by hand.
To connect, click Connect in the FW Real Estate admin header. The lock icon and the red This website is not verified text beside it do the same thing, and the Add-ons screen offers the same action as Connect to install. It is one click: your fastw3b.com client section opens, the store registers this website and sends the key straight back, and the admin returns already verified. There is nothing to copy and no key to paste.
From that moment the free add-ons and whatever your subscription covers install and enable themselves. The only manual actions afterwards are enabling, disabling and updating; add-ons cannot be deleted, so one you do not want is simply left disabled.