For those who already installed LEAKED BlackBerry 10.2.1. Aptoide will make it easier for you to install APKs.

To get APKs install on your device is very easy ;

1. Download Aptoide from here: https://m.aptoide.com/
2. Install Aptoide and open it up, swipe to the right.
3. You should be under the “available” tab. Click add store.
4. Type in “bb10store.store.aptoide.com” and click add store.
5. BB10Store should now be under your available stores.

Source : via nerdberry