https://www.ptcusercommunity.com/t5/Mathcad-Installation/Wrong-email-at-login-License-not-working/m-p/1058037#M5377 Always when i start MathCad, it starts with the wrong email, so my license doesn´t work because it´s on the other email. The problem is, that i can´t change the email Tue, 10 Mar 2026 21:52:24 GMT FS_10559114 2026-03-10T21:52:24Z https://www.ptcusercommunity.com/t5/Mathcad-Installation/Wrong-email-at-login-License-not-working/m-p/1058037#M5377 Always when i start MathCad, it starts with the wrong email, so my license doesn´t work because it´s on the other email. The problem is, that i can´t change the email Tue, 10 Mar 2026 21:52:24 GMT https://www.ptcusercommunity.com/t5/Mathcad-Installation/Wrong-email-at-login-License-not-working/m-p/1058037#M5377 FS_10559114 2026-03-10T21:52:24Z https://www.ptcusercommunity.com/t5/Mathcad-Installation/Wrong-email-at-login-License-not-working/m-p/1058171#M5380 <P>Don't understand the problem. Once licensed, Mathcad doesn't use e-mail to run the program. The license is tied to the MAC address of the network interface.</P> <P>Please be more specific regarding the problem description:</P> <P>_ Mathcad or Prime?</P> <P>- Student license?</P> <P>- What version?</P> <P>- What OS?</P> <P>&nbsp;</P> <P>Success!<BR />Luc</P> Wed, 11 Mar 2026 13:09:12 GMT https://www.ptcusercommunity.com/t5/Mathcad-Installation/Wrong-email-at-login-License-not-working/m-p/1058171#M5380 LucMeekes 2026-03-11T13:09:12Z