Hello.
First, for the old laptop, follow the steps from this article:
https://www.bitdefender.com/consumer/support/answer/2795/
Next, for the old laptop, follow the steps from this article:
https://www.bitdefender.com/consumer/support/answer/2791/
Finally, for the new laptop, follow the steps from this article:
https://www.bitdefender.com/consumer/support/answer/28558/
Regards.