Starting with the July 5, 2016, update for Skype for Business 2016 (KB3115268), the Skype for Business Basic 2016 client can now be updated using the regular Skype for Business 2016 client updates.
Customers will require the April 2016 Skype for Business Basic 2016 (16.0.4351.1001) client update in order to take advantage of this new functionality. This means that you can download the Skype for Business 2016 client updates and they will also apply to the Skype for Business Basic 2016 client.
Microsoft Skype for Business Basic gives you presence, instant messaging (IM), audio and video calls, online meetings, and sharing capabilities with the latest User Interface.. This is free download. For more information about features available in Skype for Business Basic in comparison to the Skype for Business client, please visit this page: Skype for Business client comparison chart
Note: This Skype for Business Basic MSI desktop client provides presence, instant messaging and conferencing features. If you are licensed for Office 365 ProPlus, Office 365 Enterprise E3 or Office 365 Enterprise E4, you are also licensed for the full Skype for Business Windows desktop client, which includes additional features including advanced telephony support, archiving & compliance features. Please download full Skype for Business Windows desktop client from the Office 365 Software portal following the steps in Install Skype for Business on your PC.