Claris no longer sells license keys, replacement media, or downgrade keys for version 15. No Technical Support:
FileMaker 15 reached its . Claris no longer provides technical support or security updates for this version. If you lose your original key, Claris may be unable to replace it, as they have transitioned modern licensing to encrypted certificates. For troubleshooting older keys, you can check the Claris License Key Assistance page. If you'd like, I can:
A FileMaker Pro 15 license key is a unique alphanumeric code required to activate and use the software. The license key serves as proof of purchase and ensures that the user has obtained the software legally. The key is linked to a specific version of the software and can only be used once.