I am almost 100% sure that is not a virus, it is false positive (ie. mistake made by scanner).
So update detection database for scanner (it should be doing that about every day, but update just in case).
Try to find which file is detected (that may be hard).
Also because it is ADWARE detection, sometimes this happens when files inside are packed with certain popular installers (same installer that real adware uses). And adware usually just makes unwanted popus or injects its own ads into browser. Annoying but not really dangerous.
So you safe to use 5.5.1 even if your scanner complains.
However best would be if you could double check file that is detected on virustotal, and complain to your scanner producer.
And last time (in my case) it was way Epic packaged and created unreal installer that triggered detection back then.