Cannot install/launch LilyPond

[Bob Carr]

I am unable to install LilyPond. I follow the instructions to save the file
 that comes up. But I believe that file is not what is expected. 
Here is my console log:

File "/Applications/LilyPond.app/Contents/Resources/__boot__.py", 
line 28, in ?
    _run('LilyPond.py')
File "/Applications/LilyPond.app/Contents/Resources/__boot__.py", 
line 25, in _run
    execfile(os.path.join(base, 'Python', script), globals(), globals())
File "/Applications/LilyPond.app/Contents/Resources/Python/
LilyPond.py", line 214, in ?
   AppHelper.runEventLoop()
File "PyObjCTools/AppHelper.pyc", line 174, in runEventLoop
File "/Applications/LilyPond.app/Contents/Resources/Python/
LilyPond.py", line 114, in compileFile_
    self.compileMe ()
File "/Applications/LilyPond.app/Contents/Resources/Python/
LilyPond.py", line 186, in compileMe
    shell = False)
File "/Applications/LilyPond.app/Contents/Resources/subprocess.py",
 line 558, in __init__
    errread, errwrite)
File "/Applications/LilyPond.app/Contents/Resources/subprocess.py",
 line 991, in _execute_child
    raise child_exception
OSError: [Errno 8] Exec format error
2006-05-11 11:11:51.295 LilyPond[2197] LilyPond Error
2006-05-11 11:11:51.295 LilyPond[2197] An unexpected error has 
occurred during execution of the
main script

OSError: [Errno 8] Exec format error

I would appreciate any help you are able to give me.