AirDroid is a Slamdunk!

AirDroid is a great app that lets you quickly interface with your Android device using any computer or electronic device that has a web-browser, no matter what the OS.  This provides probably the best alternative for sideloading apps onto the nabi 2 Tablet from another Android 4.0 device that has the Google Play Store installed on it.  It also provides a way to copy files (music, pictures, videos, etc.) to and from the nabi 2 Tablet without having to connect it to computer.

Thanks to Fan-a-Tech Robyn for helping test this app and bettering my initial approach to utilizing it.

If your other Android device is running less that Android 4.0, then the Google Drive Method is what you'll need to use.


PREREQUISITE: ES FILE EXPLORER/FILE MANAGER
1. Power on your other Android device.
2. Launch Google Play Store.
3. Search for ES File Explorer File Manager.
4. Click the Install button.
5. Click the Accept & Download button.
6. Open ES File Explorer File Manager.
7. Click the Yes button to enable the application.

AIRDROID INSTALLATION

8. Power on the nabi 2 Tablet.
9. Login to Mommy/Daddy Mode.
10. Launch Browser.
11. Type everythingnabi into the address bar and hit the Enter key.
12. Click on the Everything Nabi! link.
13. Locate the AirDroid is a Slamdunk! post and click on the Read More link.
14. Click to download and install AirDroid v1.1.0.
NOTE: The Amazon Appstore does not currently have this latest version available to download.
15. Click on the Download link.
16. Click on the Completed Download link.
17. Click the Install button.
18. Click the Open button.
19. Click the Start button to begin or the Next button to see some of the app's highlighted features.
20. Click on the Settings icon in the top left corner to set a Predefined Passcode.
21. Turn the Predefined Passcode switch to On,
22. Enter a Passcode and click the OK button to accept it.
NOTE: While not shown, turning on the Keep Screen Awake is a good option to turn On.
23. Back out of the Settings menu.
NOTE: The Predefined Passcode only works if both devices are on the same local area network.  Otherwise you'll need to use the random Passcode generated by AirDroid.

SIDELOADING APPS
24. Switch back to your other Android device.
25. Launch a web-browser.  NOTE: The Chrome browser seems to provide the best results.
26. Go to either http://web.airdroid.com or http://192.168.0.???:8888.
NOTE: Be sure to bookmark this address for easy access in the future.
27. Type in either the passcode provided on the nabi 2 Tablet or the one you setup in Step 22.
28. Click the Go key on the keyboard to login.
NOTE: The interface is designed for browsing with a tablet or computer and not a smartphone.  If you're using your smartphone it in landscape mode.
29. Click on the Apps icon.
30. Click on the blue Install App button.
31. Choose ES File Explorer from the Select an Action pop-up.
32. Choose the AppMgr option (2nd from the right).
33. Choose the app that you want to install on the nabi 2 Tablet.
34. Choose the File Way option from the Pick up file as pop-up.
35. Switch back to the nabi 2 Tablet and wait for the apk to be downloaded.
36. Click the Install button.
37. Click the Done button.
38. Repeat Steps 30-37 for as many apps that you want to install on the nabi 2 Tablet.
39. Back out of AirDroid by hitting the Back soft key.
40. Click the Yes button to exit AirDroid.

SIDELOADING APPS THE NEXT TIME
1. Power on the nabi 2 Tablet.
2. Login to Mommy/Daddy Mode.
3. Launch AirDroid.
4. Switch to your other Android device.
5. Launch a web-browser.  
6. Access the bookmark you saved or go to either http://web.airdroid.com or http://192.168.0.???:8888.
7. Enter your passcode.
8. Click the Go key on the keyboard to login.
9. Click on the Apps icon.
10. Click on the blue Install Apps button.
11. Choose ES File Explorer from the Select an Action pop-up.
12. Choose the AppMgr option (second from the right).
13. Choose the app that you want to install on the nabi 2 Tablet.
14. Choose the File Way option from the Pick up file as pop-up.
15. Switch back to the nabi 2 Tablet and wait for the apk to be downloaded.
16. Click the Install button.
17. Click the Done button.
18. Repeat Steps 10-17 for as many apps that you want to install on the nabi 2 Tablet.


OTHER CAPABILITIES
AirDroid also a great option for uploading files onto or downloading files from the tablet.  If you've experienced issues connecting the nabi 2 Tablet to your computer, than this is definitely the best option currently available.

AirDroid offers four options for viewing, uploading or downloading your files.  You can choose Files, Music, Photos or Videos.  
Drag and drop any file format to the location of your choosing

Listen to music off of the tablet while you upload other files from you computer.
Watch videos off of the the tablet by using QuickTime
Download pictures created on the tablet.  Delete unwanted images.
Quickly see storage details of the tablet.
The listed supported formats under the media options indicates what file types can be viewed through AirDroid and is not a limitation of the nabi 2 Tablet.  The Files options allows you to upload basically any file format you'd like into whatever location you'd like on the tablet.