Absolution is great, Sniper Challenge won’t work

I loved Absolution, but Sniper Challenge crashes IMMEDIATELY.

I have a late 2012 iMac with a 3.4 GHz Intel Core i7 and 32 gigs of RAM and NVIDIA GeForce GTX 680MX 2048 MB graphics card running latest Yosemite — it aint the computer set up… This needs to be fixed, I feel like I got a bum deal.

Ekaldany about Hitman: Absolution - Elite Edition