How to deactivate licence without access to old pc

Recently i've changed motherboard and CPU in my pc. Also Windows was reinstalled, but i forgot to deactivate my licence. Now i need to install HyperMesh but I cant, because the licence code is already in use.
Answers
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HI,
Your previous license key activation is now deactivated in Altair one, you can now reactivate the student license with the same license key.
Deactivation and reactivation feature is only if a computer breaks down and is only allowed a few times per user.
You can deactivate the license from one machine and reactivate in another by yourself if you have access to both machines as per –
https://community.altair.com/discussion/34280/altair-student-edition-deactivate-from-one-computer-to-activate-in-another-in-the-rare-case-a-computer-is-lost-or-malfunctional#latest
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