If you bought through a third-party vendor, they often keep records of your license certificates.
If you are looking to buy a new license for Version 15, you will find it nearly impossible through official channels. Claris has transitioned to a (FileMaker 2024), and they no longer sell individual legacy keys. Links found on "key generator" or "warez" sites are often bundled with malware or ransomware that can compromise your entire network. Why You Should Consider Upgrading filemaker pro 15 license key link
If the software is still installed on an old machine, go to Help > About FileMaker Pro to view the license info. If you bought through a third-party vendor, they
Massive speed improvements for hosting and data processing. Links found on "key generator" or "warez" sites
It was not designed for modern operating systems like Windows 11 or the latest macOS versions (Sonoma/Sequoia), which often leads to frequent crashes or "ghost" bugs. Can You Still Get a License Key?