Amazon decided for some reason to change the letter K to I in one of the screen savers.
Edit:
Only use the solution below if for some reason you are unable to uninstall the screensaver hack. There's now an uninstaller for one of the hacks, although I haven't tried it myself.
If you've got some screen saver hack installed, you should uninstall it before updating, or you could download this file
01N.png (don't rename it!), copy it to the directory where you keep your custom screensavers and retry the update. The screen saver hack will continue to work.