As you might have read, the game requirement is Mac OS 10.5, if you have a more recent version, please read the game manual because a little manipulation is required for the game to work properly on recent version of Mac OS X.
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On recent Mac OS X version, Elansar will not start.
So try this workaround:
Right click on the Elansar.app file and select: Show package Contents.
Go in the directory "Contents/Frameworks" of the package and copy the folder "SDL.framework" inside your root system Framework directory: "/Library/Frameworks/"
You might be prompted for the admin password.
Now Elansar should work on your Mac.
Note to non english system: The "Library" folder might be named in your language, example "Bibliothèques" for French system.
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Best regards,
Orion_