I've checked the official website, but I couldn't find anything about the software. There are only some updates listed, but those are unavailable as well. I suggest looking to see if you have an installation package reinstall the application. Before doing this, close all the background applications and run the software as Administrator, just in case to overcome issues caused by apps installed.
You can also post on the official forums and users who use the same application can give a helping hand: http://forums.support.roxio.com/