If you are being prompted to update your the karaoke app on the machine's tablet, you may see the following error message:
"For your security, your tablet is set to block the installation of apps obtained from unknown sources"
Not to worry- you can easily fix this by tapping on "Settings" and selecting "Allow apps from unknown sources".
You will then be able to install the update.
This is completely safe and you do not have to worry about installing the software update.