my old product key is not working

Hi, 

I install my "SDL Trados Studio 2019 Freelance" on my new computer, 

while I try to activate it, my old product key is not working.

How to get my new product key?

My details are as below

xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
SDL Trados Studio 2019 Freelance
Users1 In Use1 Available0
Order: 531958 Sold to: mohanmallika@gmail.com Activated: 25-04-2019
Thanks and Regards
Mohan Krishnan