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First, what is "bama auto tune"? Second, what kind file is your .CEF file? Third, what application do you have on your Mac Pro that knows what to do with any .CEF file? (Is it a file your Mac is supposed to handle?) Fourth, what do you mean by "download"? (Is it on some web site on the internet? Is it stored on a share on a server in your local network?) Why can't you "download" it just like any file would be downloaded? Does an error message show up?
There are various known types of files that use a .CEF extension. We need you to tell us something about it that would let us know what the actual problem is.