As of December 2015, you need a BlackBerry phone and BlackBerry ID to download apps from the BlackBerry World store. You can either browse and choose apps via the BlackBerry World webstore, or directly browse for, download and install apps using the BlackBerry World App on a BlackBerry device.
Use the BlackBerry World app on your BlackBerry device to download apps. You must log in with your BlackBerry ID, search for the app you want, and select "purchase" for paid apps, or "download" for free apps.
To download apps via the BlackBerry World webstore, sign into the BlackBerry World app on your BlackBerry smartphone and web browser, using your BlackBerry ID. You can then browse the webstore and purchase or download apps. You are required to complete the download requests directly on the device, for security reasons.