Community Tip - You can change your system assigned username to something more personal in your community settings. X
@KK_9884925
I believe below article will help you address Mathcad CR issue your reported/shared -
https://community.ptc.com/t5/PTC-Mathcad-Installation/Error-quot-The-server-committed-a-protocol-violation-Section/m-p/706423#M24
Thanks,
Harry