Once you've added the brochure to your cart and checked out, you will have immediate access to the brochure. You can find the 2 step instructions on the Invoice that is emailed to you, or on the "Order Details" section of your account dashboard. Click on the "View" button next to your order.
Before you can download your brochure though, you will need to make sure your Automatic Branding details have been added. This is a one time step and not something you should have to change. You will then click the link in step 2 to take you to the download's page.