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@AR_9812919
Refer -https://community.ptc.com/t5/PTC-Mathcad-Installation/How-to-convert-worksheets-created-in-earlier-versions-of-Mathcad/m-p/707521#M51
Fr more details you may also refer article -
https://community.ptc.com/t5/PTC-Mathcad-Installation/All-About-Mathcad-Software-Installation/m-p/706433#M26
I hope the above details help.
Mathcad Prime 6.0:
https://www.mathcad.com/en/try-and-buy/mathcad-express-free-download/install
https://free-dl.ptc.com/install/pim_installmgr_mathcad.exe
Mathcad 15 M050:
https://www.ptc.com/-/media/Files/Docs/Mathcad/Mathcad15-EN.zip