Here are some other references....
How to update the BlackBerry Device Software through the web
How To Reload Your Operating System - BlackBerry Support Community Forums
How to recover a BlackBerry smartphone from any state
You can install an OS from any carrier provide it is the correct version for your device, and provided you delete the vendor file. I don't know the OS installers and didn't look up the one you are trying to use. Maybe it is the wrong one, or maybe there is a problem with it.
You can install the OS just using the desktop software. The limitation is it will only install versions authorized by your carrier. Still, you may want to go this route just to get up and running. It may not matter.
Posted via BlackBerryForums.com Mobile