PDF Architect Activation

Hi! I already posted this as a question, but I don't know if it was the right mode so I start a new discussion too..
I purchased PDF Architect 2 Pro - Black Friday Edition + OCR.
Now, I formatted my pc reinstalling windows 8.1 instead of windows 7 but I can't activate products again..
How can I activate my products on new system?
Thanks
Best regards,
Giulio