I got the same thing with the latest version of Crome (36.0.1985.125). It's not a web-scanner that's throwing the error - it's Chrome itself. The exact message is "BTSync-1.3.109.exe is malicious, and Chrome has blocked it.". You can click the notice for more info which takes you to this link: https://support.google.com/chrome/answer/4412392?p=ib_download_blocked&rd=1 EDIT: Just tried to download BTSync v1.3.106 with the same version of Chrome and there were no complaints, so it looks like it's just v1.3.109 which Chrome has an issue with.