I am trying to install Lync 2013 preview from http://www.microsoft.com/en-us/download/details.aspx?id=30350
but I get an error that Lync 2013 isn't installed and I can download it from go.microsoft.com/fwlink/?LinkID=248583 - which is a link to SDK preview documentation..
I have installed Lync 2013 Basic and the previous SDK installed without problems..
Any ideas?