Instructions
Select the "PlayStation Network Store" icon on the PSP main menu and select the downloadable content (DLC) icon from the window that comes up.
Search the DLC list of the "LittleBigPlanet" update and select it. Select "Download" from the next screen. If it is free, it will begin downloading immediately. Some of the "LittleBigPlanet" DLC need to be purchased.
Select the "Add to cart" option on the DLC window if it is a "Pay Add-on" and select "Proceed to Checkout." Enter the payment information on the next screen. The DLC will be downloaded following the payment confirmation.
Press the "Home" button on the PSP gamepad to return to the PSP main menu. The "LittleBigPlanet" update will install after it completes downloading. This will update both UMD and ISO versions of "LittleBigPlanet."