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Hello @DW_8027289,
Can you please take a screenshot of the error message. Follow the below steps to do the same.
Launch Mathcad Prime > Click on M icon on top left corner > Options > License > Capture the screenshot
This would help to narrow down the cause.
Thanks,
Vipul
it says invalid and no license but i have used it since 2018 and the license never ran out
Hi @Danel_Waldl,
Please try to reconfigure your Mathcad Prime again with the text license file
Select the radio button for file and then browse to the license file and hit apply
Thanks,
Vipul