Ну там же не всё так просто и бесплатно, ниже приводится инструкция. Как всегда особое внимание уделяем тому, что под * :
1. Select the 10 images/month annual plan on our pricing page.
2. Enter the offer code PICK10FREE at checkout.
3. Start downloading 10 free images.
*The 10 images per month annual plan will automatically charge you each month for USD $29, allowing you to continue to download content without interruption. If you wish to cancel during your free trial period, visit the Plans section of the My Account page here. To ensure seamless service, the charge will happen 4 days before your free trial period ends. You may be subject to a plan price adjustment if you cancel during your first year after the free trial period. After that, your plan will automatically renew for another 1-year commitment, unless you contact us. For more details on billing, click here.
Я такое даже пробовать не буду