What you see?
CPN IDE starts, but the front-end gets stuck in the splash screen. The back-end does not start, which is shown by the Command Prompt going away.
What happens?
The front-end needs to connect to the back-end, but the back-end does not start properly. The Command Prompt running the back-end is briefly shown, but then goes away.
What is the problem?
No Java was found. CPN IDE requires Java to run the back-end.
How to solve?
Install a version of Java.