SKYPE FOR BUSINESS 2013 64 BIT INSTALL FULL VERSION
Lync Basic 2013 provides all the basic functionality that’s available in the full version of Lync (Lync 2013).It’s a slimmer version of the full Lync 2013 client and provides the same core functionality. Skype for Business Server 2019 Enterprise Edition will require full SQL Server, as indicated below (only 64-bit edition please don't use 32-bit editions): Microsoft SQL Server 2019 (64-bit edition), and you must run with the latest updates. Microsoft Lync Basic 2013 gives you instant messaging (IM), audio and video calls, online meetings, availability (presence) information, and sharing capabilities all from one, easy-to-use program. It doesn’t include all the features, just the core abilities.
There is a free “Lync Basic” client, mainly targeted at the lower end Office365 levels that include Lync/Skype for Business, but not Office Pro Plus. I’ve been asked this question a few times.