OK, another application that might conflict with Extra Decoders is Mappero (not Mapper). So if you have problems with conflicting packages, remove Mirror and Mappero, then install Extra Decoders. You can then install Mirror and Mappero again. I'm really not sure why this is necessary.
Also, I would like to remind people that it's possible to donate to support the project, copy and paste this URL into your address bar:
http://stateless.jogger.pl/files/decoders_donate.html

Can someone help me out whenever i try to intall the software I always get "Downloading Extra Decoders Support failed." what should I do?