The Grand license expired after installing new graphics card

Hi, I bought the Grand 3 at the beginning of last year and it was all working fine until I installed a new graphics card.
I first received an error message telling me the license was unrecognised but it still worked. Then it told me it would expire soon, but still worked. Now it has expired and does not work. (I’ll attachments of the error messages I get now). How do I fix this?!

Urgent assistance would be great as the Grand is in a lot of projects I’ve done and need to finish.

Thank you!!!
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Have you updated the E licenser to the latest version?

Yes. I updated the eLicenser but it’s still the same.
Thanks though!