I have Norton and just ran a full scan and Norton is up to date on a MacBook Pro - the scan found NO threats.
I downloaded Thor Lite from the Apple Store and it found 30 trojan threats - however when I searched for the files I could not find them.
Should be worried.

I found the PUA/trojan part funny. Even funnier is that it (by implied naming convention) are windows trojans.
SGFC
3
"Buy Full Version to remove detected malware file"
Very professional looking with the first three words capitalized.
"We found 30 malware(s) on you Mac." LOL.
MR KEITH SPENCE:
I have Norton and just ran a full scan and Norton is up to date on a MacBook Pro - the scan found NO threats.
I downloaded Thor Lite from the Apple Store and it found 30 trojan threats - however when I searched for the files I could not find them.
Should be worried.

Those detections make no sense, the name of the detected malware makes no sense. They are saying to you:
"Look at these imaginary problems, now pay us money."
Sounds like it is a scam to get you to purchase the full version.