ArtRage 2 crashing on OS X Leopard

When attempting to start or update ArtRage 2 on OS X Leopard, I am getting a crash

If you have an older version of ArtRage 2, you may experience a crash on startup or when updating. To correct this, download the latest version of ArtRage from // latest version of ArtRage 2 is installed to your Applications folder as ‘ArtRage 2.6’ by default.
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