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The support for Mathcad 14 ended long ago, read here: https://community.ptc.com/t5/Mathcad-Installation/Mathcad-14-How-to-Re-license-Replaced-Hard-Drives-New/m-p/1039145#M4950
If you only changed the SSD, the MAC address of the laptop should not have changed, so the same license file should be usable. Of course you have made a backup of that, didn't you?
If not, check this answer: https://community.ptc.com/t5/Mathcad-Installation/Mathcad-14-license/m-p/1033097
Success!
Luc
