It is safe to drive your vehicle when the over-the-air (OTA) update is downloading. The installation of the downloaded update will start when the car engine is off and can take up to 20 minutes.
You can view the notifications in My Mitsubishi Connect to see if the installation of the update is complete before you turn on your car. If the update has not completed, you can wait; or if you cannot wait to use the car again, the update will continue the next time the car engine is turned off.