Read the instructions in the very first thread of the link John gave you above... http://www.blackberryforums.com/gene...tml#post482649
To install this update:
1. Download and install the latest version of Desktop Manager
2. Donwload this OS and install it to the PC.
3. Delete the vendor.xml file located in c:\program files\common files\research in motion\apploader (this step is necessary any time an OS is installed from a different carrier than what is branded on the BB.)
4. Plug in BB and open Desktop Manager. You should be prompted to upgrade.