Obtaining a Mathematica Activation Key:
Student personally owned machines:
Follow the directions below to download from the Wolfram User Portal
Create an account (New users only)
Go to user.wolfram.com and click "Create Account"
Fill out the form using an @ucsb.edu email and click "Create Wolfram ID"
Check your email and click the link to validate your Wolfram ID
Request the download and key:
Fill out this form http://tinyurl.com/UCSBMathematica to request an Activation Key
Click the "Product summary page" link to access your license
Click "Get Downloads" and select "Download" next to your platform
Run the installer on your machine, and enter the Activation Key at the prompt