You cannot obtain a new license file for Mathcad 15. All new subscriptions and renewals now entitle users only to Mathcad Prime 7 or newer Existing Users:
: If you have a perpetual license or an active subscription from before 2022, you may still be able to retrieve your license file through the PTC Support Portal . mathcad 15 license file free download link
I can see you're looking for a Mathcad 15 license file and a free download link. You cannot obtain a new license file for Mathcad 15
: Many multi-year renewal options provided to users in 2021 have now expired, rendering some existing installations inoperable as of early 2026. : Many multi-year renewal options provided to users
PTC's official stance is that they cannot issue new license files for out-of-sale versions. If you are a long-time user with a valid maintenance contract, your only legitimate path is to contact PTC Support directly to see if they can retrieve your historical records. 3. Beware of "Free" Third-Party Links