Dynamics 365 Business Central, the all-in-one ERP business management solution aimed at small and medium businesses, was released as a cloud solution in April 2018. Now (October 2018) it’s available as an on-premises solution, replacing the Dynamics NAV product. It’s only available through the Dynamics Price List (DPL) and the licensing is explained in a Licensing Guide which you can find on the PartnerSource portal here: http://bit.ly/2RxQrIv.
Customers who license the on-premises solution may move to the cloud solution by purchasing Business Central Cloud Add-on licences. Premium and Team Member Add-ons are available and one or the other must be acquired for all Business Central On-Premises users. Find details on page 90 of the October 2018 Product Terms document.
In addition, existing Business Central cloud users licensed with active User Subscription Licences may install the Business Central On-Premises server software and access it under their current licences. Find details on page 21 of the October 2018 Online Services Terms document.
The Product Terms and Online Services Terms documents are updated monthly and you can find the current and archived versions here: http://bit.ly/MSproductterms.