If a printer is displaying a message about downloading anything then it is referring to a firmware update. Either the printer attempted to download its own update and is not internet connected or something kicked off the update from a connencted PC.
See if you can update the firmware and help the printer finish what it started. If not then reboot and attempt to restore the defaults or Cold Reset the printer. LJPro 200 is a model series, if you would like specific steps then please look up and confirm your specific model number.