Hi Stephen Myers:
Thanks for posting.
You can use the FileMaker Server 11 trial installer, which can be activated with your FileMaker Server 11 license key. The trial installer can be downloaded at http://fmdl.filemaker.com/TBUB/eleven/fms_trial_22.214.171.1249.dmg. Before installing, make sure the FileMaker Server 11 folder is removed from the library folder on your Macintosh HD. I would suggest running repair disk permissions before installing FileMaker Server 11. Open up the Applications/Utilities folder and launch the disk utility. Select your MacintoshHD and hit repair disk permissions. Once the repair completes, run the FileMaker Server 11 install.