After registering a qualifying audio interface, access to Pro Tools | First Creative Pack will be provided within the Focusrite account. When signed into the Focusrite account, select the "My Software" tab along the top of the page to view the additional content, including Pro Tools First.

Click on "View details". 

The link "Get Pro Tools | First" takes you to a Pro Tools | First landing page - follow the instructions on screen to download, install and activate your Pro Tools|First Focusrite Creative Pack.

To install the additional plugins that come bundled with the Creative Pack please follow the instructions in this article.