Did you get to the menu when you open up renpy.exe that has a list of games on the left and a button that says 'launch project' on the bottom right?I tried running it but this happens.
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Double check that you downloaded the mac version from the old hardware link in the 1.0a post as well, not the pc version.
Make sure you are running renpy.exe inside the renpysdk folder, not some other version of renpy.exe
That's all I can think of as far as how to troubleshoot.
Best of luck