Lync server 2013 Error: Prerequisite installation failed: SqlInstanceRtc

When installing Lync server 2013  this error bugged me.

What could be wrong. with SqlExpress? Tried installing “sqlexpr_64.exe” from the DVD and here is my problem.

Something went wrong when I downloaded the ISO image. Deleted the downloaded imaged and did a new download. After mounting the image I ran setup.exe and the same error appeared. I then remembered that Lync setup copies setup files to the cache. Deleted Lync setup cache directory from “C:\ProgramData\Microsoft\Lync Server\Deployment”. After this the install ran perfectly.

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