Files downloaded using Ares are free; however, the program itself is not. It is only legal to share and download material that is not copyrighted. Downloading copyrighted music without paying for it is illegal.
Ares is a peer-to-peer file sharing program. Users upload files that other users are able to download to their own computers. It is illegal to download any copyrighted material without permission from the owner of the copyrighted material. Owning Ares does not authorize access to such material.
A free version of Ares is available on Ares.com. However, it may not work correctly, and there is no support for it. Free downloads of Ares from other websites are often illegal and full of viruses, so Ares.com advises against using those versions of the program.