This tutorial was last updated on December 3, 2013.
The Tor Browser Bundle is available for download on a multitude of sites. However, it is highly recommended that you only obtain the package files from torproject.org, the official home of Tor. Mac users can choose from over a dozen languages, ranging from English to Vietnamese.
To begin the download process, navigate your current browser to https://www.torproject.org/projects/torbrowser.html.en. Next, scroll down until you find your desired option in the Language column, clicking on its corresponding 32-bit or 64-bit link found under the Mac OSX header and circled in the example above. Once the download is completed, locate the compressed .zip file (TorBrowser-x.xx_language.zip) and launch it. An .app file will now be extracted and saved at your specified location, containing all package files and named TorBrowser_language.app.
To ensure that you have received the intended package, and were not duped by a hacker, you may want to verify the signature on your downloaded package prior to utilizing it. To do so you'll need to first install GnuPG and download the package's associated .asc file, available on the Tor Browser Bundle download page. Visit Tor's signature verification instructions page for further details.