Yes, well. Despite that fact, I would still like to have the option to download those files. If I'm spending hours of my time downloading a file... maybe I... oh what is it? Maybe I...hmmm... what is it that I... WANT! OH THAT'S IT! WANT! MAYBE I WANT THE DAMN FILE!
The issue that you're talking about is the virus. The issue I am talking about (along with the OP, I'm sure) is CHOICE.
Of course there's risk involved. There are viruses everywhere. It's not Limewire's job to clean out our computers. It's ours. That's why we have virus protection programs. That's why we do scans.
Anywho, gotta fly. I need to find another way to download the files I'm looking for! Cuz obviously Limewire is not going to do the job.

How large is the file? If it's a video movie & less than 500 MB in size then it's either going to be poor quality or porn or similar.

The LW company is under pressure from authorities to add these security measures to the program. You might be unaware but LW has been undergoing court action & negotiations for a couple of years now. This is another reason LW no longer offers older versions at their site.