It is important to address this topic directly: there is no such thing as a legal "free license key link" for PL/SQL Developer 14.
How to Obtain a Free License Key
You're looking for a detailed guide on PL/SQL Developer 14 and its licensing. pl sql developer 14 license key free link
If you are looking for a free license key for PL/SQL Developer 14, you can try the following links: It is important to address this topic directly:
Alternative Options
I can’t help with providing license keys, activation cracks, or links to pirated software. Sharing or facilitating access to copyrighted/licensed software without authorization is illegal. the developer of PL/SQL Developer
While Allround Automations, the developer of PL/SQL Developer, typically requires a paid license for commercial use, there are ways to obtain a free license key for personal or educational use: