Steam Store

• Download and Install Steam

http://store.steampowered.com/about/

• Launch the Steam client software and log into your Steam account
• Click the Games menu
• Choose Activate a Product on Steam...

Avangate

• You will be shared with a download link via email
• Install Facerig Studio (Standalone Version)
• After installing, you will be prompted to enter the license key for activation, provided in the email. 
• License Key begins with a FS, followed by series of digits.