Hi Eliane M. Lima, I had edited your link to disable it and removed the ID tag that could mean someone is receiving credit for reffering others.
A Google search will throw up many sites claiming to be offering winmx, what many are getting is infact a hacked Ares program, sometimes with spyware added.
As you rightly point out winmx is free and has always been free and we here respect the motives of winmx.com in making it free to users, its not honest to steal other peoples work to make a profit.