Update OS stuck

When we turned on the computer, kano asked us if we want to Update Kano, so we clicked update. Now it just shows black screen with the mouse, stuck there with no sign of progress. What am I supposed to do??
Can I turn off the computer and turn it back on or would that make all the programs unstable?

You may have to format the SD card, reinstall Kano OS on a Mac/pc, and use Etcher to burn the image back onto the SD card