XDocsFMx requires the prior installation of DITA-FMx 1.1. Before installing XDocsFMx be sure to complete the DITA-FMx installation. If you’re only using DITA-FMx with content from the XDocs repository, you can omit the installation of the default DITA-FMx structure applications and just install the XDocsFMx apps (although, we recommend that you install all of the structure applications for greatest flexibility).
After DITA-FMx has been installed, continue to Running the Installer.