Looks like the source of the file is not telling the truth . . . . there are a lot of spam results out there, so you probably aren't doing anything "wrong."

for mac programs, stick to .dmg's or .sit's. They aren't much used in the Window's world (unlike .zip files).

Lastly, most mac software programs are quite generous in allowing free trials, and are far more reliable from the original developer's website. I would rarely use p2p for finding a reliable mac program, and when I just want to see what's available, the OS X Apple menu's "Mac OS X Software . . . " item allows me to play with lots of interesting programs.