If you are still having issues, you may want to try contacting directly.
MITCalc offers flexible licensing options to suit different engineering needs: A one-time purchase with no time limitations. Mitcalc Authorization Code
If you upgrade your hardware or switch workstations, your old code will no longer function because the User ID has changed. If you are still having issues, you may
Ensure the code you generated is for the version of MitCalc you have installed (e.g., v1.75 vs v1.76). If you are still having issues
Using a third-party or pirated authorization code can result in a loss of functionality and violates the licensing terms.
To avoid losing access to your engineering suite, keep these best practices in mind: