Installing the File Manager.
Make sure your Player is open on your Playbook.
Download
MEGAUPLOAD - The leading online storage and file delivery service and place it in the C:/platform-tools/ folder.
Hit the start key and in the search box type cmd and hit enter.
Type "cd C:\platform-tools\"
Type "adb connect xxx.xxx.xx.xxx:5555" Replace xxx with your ip
Screen will read: "connected to xxx.xxx.xx.xxx:5555"
Type "adb root"
Screen will read "restarting adbd as root"
Type "adb connect xxx.xxx.xx.xxx:5555" Replace with your ip
Screen will read: "connected to xxx.xxx.xx.xxx:5555"
Type "adb install Astro.v2.3.1.noexpire.apk"
Screen will eventually read: "Success"
Now you can install all your apps (Well Android ones anyways...) via the File Manager.
On the recent tasks screen swipe down from the top bezel.
Choose Set Home View and choose Installed Applications, and down at the bottom should be Astro. Click and accept the agreement.
After you open Astro...
Select the Download folder(all the apps you want to install must be in that folder on the PB)
Select the App you want to install.
Select the Open App Manager option and select Install and then Install once more.
Repeat as needed.