I recently tried to download the latest X2Go client.  Multiple browsers give an error on the download about the application being malware/virus.  Further, I was greeted with Microsoft Windows Defender SmartScreen stating: "Windows Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk."  This is my first time downloading this version, so I don't know if this is an issue with SmartScreen or with the binary.  I did not have this issue a couple of months ago when I downloaded 4.1.2.0.