Newsletter has a set of add-ons to integrate other plugins in many different ways. Contact form designers can be integrated to collect subscriptions, e-commerce plugins are integrated to send newsletters to specific customers, and so on.
An integration usually requires the presence of a third-party plugin, updated to enough recent version anyway add-ons try to verify the version compatibility at startup showing an administrative notice if required.
Integration add-ons could require server resources hence it is recommended to not install and activated the unnecessary ones. For example, if you’re not running WooCommerce there are no reasons to install our integration.
If you just want to have a copy of the package, download it from your account page and keep the zip package on your PC.