Nokia Software Updater is the official utility Nokia provides to update the pre-installed software in their mobile phones.
It is very easy to use. You just have to connect your Nokia mobile phone to the PC with the original USB cable provided, and execute the program. Automatically, Nokia Software Updater detects your concrete phone model, downloads the corresponding update and installs it. It is that simple.
Summing up, Nokia Software Updater is the utility you need to apply the updates Nokia develops for your mobile phone.