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UPGRADE Licence Key not working

Thread needs solution

I have just re installed my laptop, including Home 12, however the upgrade licence key (that previously worked OK) will not be accepted. The main key works without problem, but the upgrade key (no matter what old licence number I put in) does not. I do not get an error message, and the "Activate" button is active, although nothing happens when I click it.

I can move the main licence from the PC to the laptop, but then I can not activate the PC with the upgrade key either.

I am at a loss as to where to go next.

TIA

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