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# To install/upgrade the BlackBerry OS you installed on your PC you can do one of two things.
# If the OS you installed on your PC is your service providers, simply run BlackBerry Desktop Manager and select Application Loader.
# If the OS you installed on your PC is unofficial or from another service provider you must use the Loader program, which you can find in the same location the vendor.xml file was:
* On your PC go to Program Files > Common Files > Research In Motion > AppLoader
# I prefer using the Loader program (official OS or not) because it is basically the Application Loader without the BlackBerry Desktop Manager running in the background.