It has been brought to our attention that recent Windows Defender signatures detect some 16.01 installers to include the Trojan "Win32/Varpes.L!plock". This is a false positive. Hopefully the signatures of Windows Defender will be updated soon to fix this.
Unfortunately this is out of our scope and such things already happened in the past and will be as AV solutions tend to be more and more aggressive when it comes to detecting possible threats.