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Cannot use license after reinstallation. Need new license
1. What version of Mathcad are you using?
2. 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
What steps you have performed during re-installation and what error do you get after re-installation?