You can install Feed Me via the plugin store, or through Composer.
To install Feed Me, navigate to the Plugin Store section of your Craft control panel, search for Feed Me, and click the Try button.
You can also add the package to your project using Composer.
cd /path/to/project
composer require verbb/feed-me
You can try Feed Me in a development environment for as long as you like. If you are trying the Pro version to import non-entry elements, you are required to purchase a license after adequate testing, whether your site is live or not.
For more information, see Craft's Commercial Plugin Licensing.
Available for Craft 2 & Craft 3, with Free and Pro versions.