Install BAR files directly from your BlackBerry PlayBook.
First Install
You need to sideload LocalBar using your PC/Mac. There are many guides on the Internet. Here is one of them:
How-To Side Load PlayBook Apps
Next time when the upgrade of this app is available, you can install the upgrade directly from PlayBook using this app.
Guide
You MUST enable development mode before installing the apps (you should have done this step when you sideload LocalBar.
Continue reading for rest of the steps on How-To install BAR files directly from your BlackBerry PlayBook
You will need to grant some privileges to this app after first install.
Here is the main screen after you grant the privileges.
Swipe down from the top bezel to show the menu.
Choose “Install”. It will show the list of bar files that you have. It will automatically scan all your documents folder (including downloads folder from the browser).
Select a bar file, a confirmation dialog will appear.
Click OK to confirm. A password dialog will appear. Just ignore the user field. This is the PlayBook standard login dialog, and I haven’t explored yet how to disable the username field. And you need to press the OK button (the “Return” key doesn’t work yet).
And this dialog should appear if everything is fine. After you fill in the password, it will start the installation. If everything is fine, then this dialog should appear.
Source: Yohan.es