FILEMAKER SERVER 12.0V6 UPDATE
FILEMAKER SERVER 12.0V6 UPDATE provides support for – and works only on – Mavericks:
FileMaker Server 12.0v6 is for installation on OS X Mavericks only.
Note: When you upgrade your server’s operating system, you must reinstall FileMaker Server. Because this software is for OS X Mavericks, it is a full installer rather than an updater.
Updates in FileMaker Server 12.0v6
The FileMaker Server 12.0v6 adds support for OS X Mavericks and is for installation on OS X Mavericks only.
Software Update: FileMaker Server 12.0v6 and FileMaker Server 12.0v6 Advanced release notes | FileMaker.