Updating Titanium SDK for Appcelerator Studio

Open Terminal (Located in the 'Utilities' folder under 'Applications' in 'Finder') and run the following command:

appc setup

The server should prompt that the latest Appcelerator Studio has already been installed (if not, please contact our support staff):

Finding latest version ...5.1.0 ✓
Version 5.1.0 already installed.
? Do you plan on developing Titanium apps? (Y/n)

Simply answer the question with "Y" and the server will install the latest Titanium SDK for you:

A new version of the Titanium SDK is available, will download it...
New version available! 5.1.2.GA

Downloading http://builds.appcelerator.com/mobile-releases/5.1.2/mobilesdk-5.1.2.GA-osx.zip
  100% [========================================] 0.0s   

Extracting SDK to /Users/user6595/Library/Application Support/Titanium
  100% [========================================] 

Setting Titanium SDK 5.1.2.GA as the default.

Titanium SDK 5.1.2.GA successfully installed!

Congrats! No issues detected for developing cross-platform mobile apps!

appc setup complete! 

If you experience any issues with any of these steps please don't hesitate to contact our support staff.