[Si|ent]

The original files may well have been clean, explaining how you got no alerts when you downloaded those.
But the updated files he uploaded yesterday when he edited the thread to change the download link were loaded with 3 different viruses, one of which was there 3 times.

I opened it in a virtual machine and it was most definitely not 'harmless'

@xSiiiLenTx, Don't try to do it manually, let your AV take care of it. It should quarantine the infected files, enabling you to remove the directory afterwards