Download the software at: http://mamp.info/en/ Click Download Now button. It’s a big download, so it takes a while to complete. (MAMP is free, but the download also includes the commercial product, MAMP Pro, which makes administering MAMP easier. You don’t need MAMP Pro for this tutorial, and you don’t have to install it either.)
Once downloaded, the file (named something like MAMP_1.7_universal.dmg.zip) unzips itself, and appears in the list of volumes in a Finder window. In addition, License Agreement will appear; click Agree and the window pictured in Figure 1 below should appear. (You may need to double-click the .zip file to unzip its contents.) Full Article