Yes, it looks like the charging module was in use and it couldn't update until you unplugged the charger. After you unplugged, the car could continue with the installation process.See above. It said that while updating the control units both driving and charging were disabled. I have to think that unplugging and the instant completion of the download were connected.
But at this point it wasn't trying to download. It was installing the update. You can interrupt download process at any time, but must wait for update to finish before driving the car.