I can assure you, FH has absolutely no malicious software contained in it's setup/download. You could PM a staff member and they will say the same thing.
Some anti-viruses will give warning about FH, but that's only because it's a uncommon download.
Here is a really good anti-virus if you really want to check:
MalwareBytes (http://MalwareBytes.org)
Some anti-virus programs doesn't recognize FeralHeart, and instead takes for granted it's a virus.
As the other's have said there is no viruses in the FeralHeart game.
You need to add FeralHeart to the "safe list" on your anti-virus program.