We purchased the Enterprise Scale One-time package, we are looking to get to the latest version. If I purchase a new license, will that invalidate the old as we want to control the migration of our DEV/QA/Test environments
The purchase of a new product never affects the old one. You would just get a new license key and the old one would still work.
However, we provide a one-time product update with a discount. Please email us at email@example.com and we will provide you link where to pay and update your license key in place. So you will continue using your current one.