This is due to a java version problem:

I'm trying to register my copy of qstudio. When I enter the license key, I get the error message
You are running a newer version of java >16. On newer java versions you must register using the new key format.

To Fix for Now

Use this license key:

The Problem Details

QStudio is over 10 years old and it's registration uses an encryption method that java vendors are removing in newer versions.

If we switch to a new encryption method, old keys would stop working so we need to transition and for a period support both key types (very annoying for us all).

Longer Term

This error will no longer happen.