EE4 Developer License
The Developer License of Event Espresso gives you all the features, but support for up to five different websites.
Documentation for Event Espresso 4
https://eventespresso.com/support/documentation/versioned-docs?doc_ver=ee4
https://eventespresso.com/support/documentation/versioned-docs?doc_ver=ee4
This is your chance to leverage the power of Event Espresso and online event registration on your many WordPress websites or projects. You can deploy each license on a sub-domain or sub-directory or license them to separate clients. Either way, this is the most economical way to get the most Event Espresso for the money.
Add-ons are sold separately, see A New Direction for the Event Espresso 4 Support Licenses.