Yes I did buy and download the software from the itch.io site. It's actually not the Anti Virus but Windows Defender SmartScreen that does it. Otherwise Norton file insight detects it as "less than 50 users in the Norton Community have used this file" and a "Good" rating.
Thank you for this information. To my knowledge it is safe to use SUVA. If this turns out to not be the case at some point I am going to alert everyone.
