I am replacing my current Windows 10 PC with a new one and I have not been able to determine hove to move the license for AnyDVD HD from the old system to the new. I do not know where the keys are kept.
The license file got send to you via mail. If you do not have this mail anymore and cannot find the key file on your system, then use this link: https://shop.redfox.bz/lostkey.php
Essentially, just reinstall the program fresh and like DeepSpace says reinstall your license. Easy peasy.
Search in your email for "Redfox" and a file attachment with that pattern: AnyDVDHD_Key_XXX-XXX.AnyDVDHD.