My Son no longer use it and lost log in information. how can i go about getting a license transfer for this product
Take a look at this article - https://support.native-instruments.com/hc/en-us/articles/360001301669-My-Serial-Is-Already-Registered-to-Another-User-Account. It explains what to do when you get used hardware and the seller can't give you a licence transfer.
Hello,
on the login screen you can click on "Don't remember your password?" and try to reset it. Or try this link Account Login & Password Support