License Key rejected. Invalid.

My license key for Backupper Professional isn't being accepted on a clean install of W8.1.

This license key has only been used on this one PC and its last activation was for a W10 installation some months ago. I've never encountered this before although this old PC is used as a test bed for various operating systems and the license key has seen a few previous activations, all of which have always been successful. I installed the latest version of Backupper from the downloads section of the site.    


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