Thanks for your help Hans.
Quoting "hans-g." <forums_noreply@adobe.com>:
I PURCHASED ELEMENTS 10 AS PER INV. AD000776420AP. I STILL HAVE THE
SERIAL KEY BUT DO NOT KNOW HOW TO INSTALL IT ON MY NEW LAPTOP
created by hans-g.[1] in /Photoshop Elements/ - View the full
discussion[2]