MacMiner supports Mac OS 10.7 Lion, 10.8 Mountain Lion, 10.9 Mavericks, and 10.10 Yosemite and has a legacy version supporting 10.6. You can check your operating system here:
What's my OS?
You can download MacMiner at the homepage, /macminer/.
Decompress the .zip file if your browser doesn't do it for you and move MacMiner.app to your Applications folder. MacMiner is now installed and you can move on to Basic Usage
If you don't find what you're looking for here, please check the forum