Torrents? A lot of torrents are malicious.
Software from 3rd party vendors? Avoid it, usually, comes with bundle ware.
Point is like people mentioned, it is best to go to the developers' website and get the software directly. If it is paid software and you want it, try looking into alternatives or save up some money. Anything that is "free" might not be legitimate. Always be cautious of what you are downloading.