If you compare the Visual Studio binary between the Microsoft and Softonic there are not going be the same.
Some people in the Net have posted you can try to scan the Virus or Malware after you have download it like this one http://forums.majorgeeks.com/showthread.php?t=282440. Not everything Virus or Malware is easy to remove.
In Wikipedia, there is this sentence “Since 2009, the site has been severely criticised for its downloads installing adware even if the user opted out of its installation”.
Interesting things is they provided the fake report suck as https://www.siteadvisor.com/sites/softonic.com or https://safeweb.norton.com/report/show_mobile?url=softonic.com. If you go to https://www.whois.net/ and check then you will know the two sites neither below to norton nor McAfee.
Believe me or not, to me Softonic is not safe.