https://community.ptc.com/t5/Mathcad-Installation/Mathcad-15-Installation-issue/m-p/730612#M608 Installation issue with Mathcad 15. Received an "unexpected error" message - The server comitted a protocol violation. Section=ResponseHeader Detail=CR must be followed by LF Mon, 24 May 2021 18:34:36 GMT KY_9926404 2021-05-24T18:34:36Z https://community.ptc.com/t5/Mathcad-Installation/Mathcad-15-Installation-issue/m-p/730612#M608 Installation issue with Mathcad 15. Received an "unexpected error" message - The server comitted a protocol violation. Section=ResponseHeader Detail=CR must be followed by LF Mon, 24 May 2021 18:34:36 GMT https://community.ptc.com/t5/Mathcad-Installation/Mathcad-15-Installation-issue/m-p/730612#M608 KY_9926404 2021-05-24T18:34:36Z https://community.ptc.com/t5/Mathcad-Installation/Mathcad-15-Installation-issue/m-p/730655#M610 <P>Please check <A href="https://community.ptc.com/t5/PTC-Mathcad-Installation/Error-quot-The-server-committed-a-protocol-violation-Section/m-p/706423#M24" target="_self">here</A>.</P> <P>&nbsp;</P> <P>Success!<BR />Luc</P> Mon, 24 May 2021 21:22:27 GMT https://community.ptc.com/t5/Mathcad-Installation/Mathcad-15-Installation-issue/m-p/730655#M610 LucMeekes 2021-05-24T21:22:27Z