According to Windows ® Defender of Windows 10 download smtube-16.3.0-x64.exe on sourceforge.net is infected with Trojan Win32/Varpes.M!cl.
The SHA1 hash of the local download is the same as the one stated on the downloads page.
Searching the web strongly suggests downloads on sourceforge.net have been including malware several times before. So wouldn't it eventually be advisable to stop using this platform?
Also, it would be good if SMTube was covered by Windows signatures, much as SMPlayer is already by now.
Anyway it would be nice if you could give some feedback what's going on here.