I'm surprised to hear Reason is still around.
A little story about Andrew over at Reason...
Many years ago Andrew invented what was one of the best anti-spyware/riskware/adware programs ever made 'GIANT Antispyware'. It was so good Microsoft bought it, along with Reliable Antivirus (RAV) and integrated them together to make Windows Defender. Andrew was rich after this however his non-compete agreement forbid him from commercially releasing another security product for a LONG time.
So Andrew invented Herdprotect on-demand scanning. That utilized both his own cloud and VT for on-demand scannings and he utilized the millions of scans a month with Herdprotect to create his own antivirus/riskware database. Ultimately with the goal once his non-compete ran out he would release a new product.. Enter Reason Core Security.
Now to be honest. I'd just use Herdprotect. He pulled the download of it, but the backend is fully functional including the Reason Cloud AND VT. So if you want a lightweight, fast on-demand second opinion scanner why not find a copy of Herdprotect and use that?
1.0.3.9 was the last version, get it from Majorgeeks stored repository, not the authors.
Download herdProtect - MajorGeeks