Hi! I have an iMac and a Mac Book Aire. Y dowloaded in the iMac from the link above the software but when I'm going to install it a message tells me that it can be installed because is from an unknown source. How can I fix this??? Thanks!!!
Welcome to the Apple Support Communities
You don't have to install any update to use Remote Disc with your Mac. You only have to install the DVD Sharing update if you are running Mac OS X 10.4.11, but your iMac is using OS X 10.8.2, so you don't need it. Follow the steps of the link to use Remote Disc with your computers