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What files do you wish to download, relating to the X-4 Flash (which I guess is this kind of device:
If they are update files for the device, then they can presumably be applied with the X-4 device not hooked up to the truck. In fact, unless you have a laptop computer to apply the update files from, you may *have* to have the device not hooked up to the truck, to do the update, if it is the sort of update that has to be run on a computer with the device hooked up to the computer with a cable.
But this isn't a final answer - so let me know if I don't seem to have covered what you need to know, by using the Reply To Expert function, and I will complete the answer properly.