Well the download is pretty safe from what I know StoryBrooke so I'm not sure about you getting a virus from it especially if you are downloading the game from the link provided on this site. Your virus protection software in your computer might just think the file is corrupted and is giving you a false warning. It happens to most people here who try to download it. If it gives you a warning just try clicking the link again and try to download it again, if the warning comes again click "ignore" or that you trust the site or whatever option you have there.