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7) Once installed, please run all available Office and Windows updates to update to Skype for Business 2015.

More infomation

Client comparison - https://technet.microsoft.com/nl-nl/library/dn933896.aspx
About the licenses - https://blogs.technet.microsoft.com/office365labs/2016/12/23/skype-for-business-licenses-clients-and-add-ins-demystified/