Solved
.dat license file not working with Matchcad 15
The LIcense .dat file does not seem to be working when installing on a new computer.
Tip - "How to Transfer Mathcad license from an existing Host ID to a new Host ID for commercial license": https://community.ptc.com/t5/Mathcad-Installation/How-to-Transfer-Mathcad-license-from-an-existing-Host-ID-to-a/m-p/788323#M1599
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