This plugin can be installed from the Craft Plugin Store or with Composer.
Open your Craft project's control panel, navigate to the Plugin Store, search for Field Field and click Install.
Open your terminal, navigate to your Craft project's root directory and run the following command:
composer require spicyweb/craft-field-field
Then open your project's control panel, navigate to Settings → Plugins, find Field Field and click Install.
Field Field 2.x requires Craft CMS 5.