You can buy CAD pockets premium edition from website and app .
Purchase with mobile
Login on your app with your mobile, click the [Me] tab, and find the [upgrade] menu, to purchase
After you paid successfully, you can click your avatar to check the expiration date in the personal page
Purchase from website
Login www.cadpockets.com with your account which you want to upgrade, click the [price] menu to buy, at the time being, only Ali pay is supported.
After you paid successfully, please go to the personal center to check the expiration date.