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Topic review

Waruwaru

My mistake. I have read 10 as 18. Too small font/screen on this device. :)
martin

@Waruwaru: No.
WinSCP-5.15.7-Setup.exe – 9 MB
WinSCP-5.16.2.RC-Setup.exe – 11 MB

The difference in Defender behavior is in a certificate used to sign the installer. 5.15.7 is signed with a new (re-issued) certificate. While the 5.16.2 is singed by old certificate, which will expire in few months.
Waruwaru

Hint: 5.16.2 RC is working fine. Its have very different filesize.
5.15.17 = ~10MB
5.16.2 = ~20MB
Maybe a compiler issue?
martin

Re: Version 5.15.7 is blocked by Windows Defender SmartScreen

We have reported it to Microsoft.
Their response is:
We’ve reviewed your submission and we've confirmed that the submitted files are clean. Windows Defender Antivirus doesn't report them as malware.

The message you observed is a notification from Windows Defender SmartScreen indicating that the application does not have known reputation in our system. Application reputation warnings are meant to inform end users when applications do not have known positive reputation. This doesn’t mean that the application is malicious, only that it is “unknown”.  Please note that users can still proceed to download and run the application.

In most cases, a digitally signed application will establish reputation organically, unless something has happened to denigrate existing reputation such as being used to sign malware. We will investigate this issue further and contact you if we need additional information.
martin

Re: Version 5.15.7 is blocked by Windows Defender SmartScreen

Thanks for your report. Are there any useful details, if you click "Weitere informationen"?
Waruwaru

Version 5.15.7 is blocked by Windows Defender SmartScreen

I upgraded to 5.15.7 and get a blue popup with message translated:
The computer was protected by Windows
Windows Defender SmartScreen prevented an unknown app from starting. Running this app may pose a risk to your PC.

Screenshot attached.

System; Windows 10 (1903)
Is here something missing? Jump up to version 5.16.2 is working fine.