First and foremost, let me clarify that the blackberry app world has been changed to Blackberry World. Just in case you are looking forward to downloading and installing app world and you end up seeing blackberry world.
Ordinarily, the app world AKA blackberry world, comes pre-installed on blackberry smartphones and devices. Irrespective of the fact that you are using a blackberry Curve 2, curve 3, curve 4, bold 2, bold 3, bold 4, bold 5 (9900 and 9930), Q5, Q10, Z10 etc (as long as it runs on OS v5.0 upwards), blackberry world comes pre-installed on the device.
But for diverse reasons, you may encounter issues with using the pre-installed app and the only option left for you will probably be to delete the pre-installed and download another app. Or you have issues updating the app and the next option is to download the latest version of the app, this post is to aid you on that.
Download and Install App World On Your Blackberry Smartphone Devices
The simplest way to do this and to make sure you are downloading the latest version is to visit www.blackberry.com/appworld/download.
When the page opens fully, click on download and your download should start.
If you are having problems with downloading or installing the app world (Blackberry World) application on your blackberry device, do let us know via comments.