"Download Selena - Ones (2002) rar"
But if you are referring to it as a title of an album, it should be:
Or:
Or, in a more grammatically correct and formal tone:
"Download Selena - Ones (2002) (rar)"
"Download the rar file of Selena's Ones (2002)"
The proper article would be:
"Download Selena's Ones (2002) as a rar file"