This is a common issue with software that uses node-locked licensing like Mathcad 14, where the license file is tied to specific hardware identifiers of the computer. Even though you replaced the motherboard with the same model, the system's unique hardware IDs, such as the MAC address (of the network adapter) or potentially the hard drive volume serial number, have likely changed, invalidating the license.
Here's a breakdown of what's happening and your probable next steps:
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License is Tied to Hardware ID: Mathcad 14's license file, often named license.dat, is typically locked to a unique hardware identifier. For older versions like Mathcad 14, this often was the MAC address of the primary network card or sometimes the volume serial number of your primary hard drive. Even an identical model motherboard can have a different MAC address.
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Verify the License Host ID:
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Find your Mathcad license file (license.dat). Open it with a text editor like Notepad. Look for an entry similar to HOSTID=PTC_HOSTID=XX-XX-XX-XX-XX-XX. This is the hardware ID your license is bound to.
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Compare this to your current hardware ID(s). To check your current MAC address(es), open the Windows Command Prompt (search for cmd) and type ipconfig /all. Look for the "Physical Address" under your Ethernet or Wi-Fi adapter. If the addresses don't match, that's the cause.
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Contact PTC Support (or a VAR): Since the hardware ID has changed, you will need a new license file from PTC (the developer of Mathcad). They are the only ones who can generate a license file tied to your new hardware ID.
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You will typically need to provide them with the new hardware ID (e.g., your new MAC address) and proof of your original license.
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Unfortunately, support for Mathcad 14 has officially ended, which may complicate the process, but they might still have a procedure for transferring an older license due to hardware failure.
ALSO SEE Mathcard transfer license from old machine to new ... - PTC Community
