Root [T-Mobile] Download Original GS3 OS for MAC?

All I can find are zipped files for Windows. I know there's a file for Mac I just can't find it. Could anyone link it for me please? I have the TMobile SGH-T999.

And please don't tell me to use a Windows computer. Trust me, I hate this mac more than you know. But I really don't have a choice right now as I live in the middle of no where for the summer. All I have is this computer