Can't authorise any of my BFD products

Hi anybody (Drew),
I have just reinstalled the operating system on my machine and can’t install any BFD3 products (not even tried BFD2 yet).
I have downloaded the BFD license Manager, tried to run it and it just says unknown error when I try to license. After which, it says Not authorized (no license found).
What do i do? Please help!
Greg

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