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Mathcad student edition: https://store.ptc.com/store/ptc/en_US/list/ThemeID.21925700/categoryID.10011800
Hi,
I am not sure whether you are using Mathcad Trial Edition or Student Edition.
For Trial Edition, you are allowed to use it only once.
And, for Student edition you can use above shared link by Vladimir to purchase student edition Mathcad license.
Regards,
Rahul Ghadge