To download applications again, please launch Nokia Store, look for the application you want either in the application catalogue or click My Stuff (on the lower right corner of display) >Download history > All downloads , then select the item and click the Download button.
The easiest way to download applications involves opening the Nokia Store website http://store.nokia.com with your PC web browser. When you have Nokia Suite running on your computer and your phone is connected to the computer with a USB cable, you can easily search and download free applications directly to your phone. Some applications might not be compatible with Nokia Belle yet, and therefore there will not be a working version available for you after the update. For your important applications, please visit Nokia Store before the update to see and check Nokia Belle compatible applications.
Note: The maximum amount of re-downloads is 10 times per app.