The Skype for Business 2016 desktop client currently comes in two flavors: Full Features and Basic.  The Full Featured version of Skype for Business is provided with certain Office 365 application packages, including the Online Plan 2, Business Essentials, and Business Premium.


The Skype for Business 2016 Basic desktop client can be downloaded from Microsoft for free at the following link:


https://www.microsoft.com/en-us/download/details.aspx?id=49440