Instructions:

Open "Sniper_Elite_-_Berlin_1945_v1.0.0.5.dmg", not the files with ".dmgpart" and drop the application to any destination in your Mac computer. 

DON't play it directly from the DMG, play it out of the DMG in any location of your Mac computer.

Language is english, I'm from spain and GOG do a version in english only. I don't know if inside the game are the langauges, if you have any solution be free to post it in comments.

Resolution in widescreen mode (16:9) only have 1920x1200. I don't know how to change it to other widescreen resolutions, if you know how to change that, post it in comments.

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GOG description:

What's cool about it:

Realistic shooting mechanics that consider your heartbeat, your breathing, wind and gravity
Hide dead bodies, move stealthy and kill Soviet and Nazi soldiers from the perfect hiding spot
A wide variety of World War II weapons and interesting missions like assassinations, fire support, infiltration

Overview:

The Second World War is coming to an end. The Russians and the Germans clash in a city devastated by the war. You incarnate the best sniper of the OSS (the old CIA), inserted among the Germans to see to the success of vital missions against the NKVD. Your goal: get your hands on materials related to German nuclear technology before the Russians.

The Cold War has begun.

Multiplayer notice: The game's multiplayer servers have been taken offline, however, multiplayer over LAN is still available.

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System Requeriments:

OS X 10.6.8 or later. 
Processor: Intel Core 2 Duo 2GHz+ 
Memory: 1GB of RAM 
Graphics: 64MB of video memory 
Recommended two-button mouse, or Apple mouse with Secondary Button / Secondary Click enabled.

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SPECIAL THANKS: I want to say thanks to "enigmat1c" from the german Boerse forum, he is the real uploader of this game, but in direct download.

I'm not taking money with this upload, my only purpose is share this game to the people for enjoyment.

Enjoy the game.