add Microsoft Visual C++ Redistributable to instructions for sdr_transceiver
</li>
<li>Connect an antenna to the IN1 connector on the Red Pitaya board.</li>
<li>Download and install <a href="https://www.dropbox.com/sh/5fy49wae6xwxa8a/AAAdAcU238cppWziK4xPRIADa/sdr/sdrsharp_v1.0.0.1361_with_plugins.zip?dl=1">SDR#</a> or <a href="http://www.hdsdr.de/" target="_blank">HDSDR</a>.</li>
+<li>Download and install <a href="https://www.microsoft.com/en-us/download/details.aspx?id=53587" target="_blank">Microsoft Visual C++ 2015 Redistributable</a>.</li>
<li>Download <a href="https://www.dropbox.com/sh/5fy49wae6xwxa8a/AAABy8xWrv4wFFbkYfmVU6DGa/sdr/ExtIO_RedPitaya_TRX.dll?dl=1">pre-built ExtIO plug-in</a> for SDR# and HDSDR.</li>
<li>Copy ExtIO_RedPitaya_TRX.dll into the SDR# or HDSDR installation directory.</li>
<li>Start SDR# or HDSDR.</li>
