SFTP won´t start on Win 8.1

I have downloaded and installed SFTP 6.0.2146-0 (64-bit) on a Windows 8.1 with Classic Shell.
It installs without errors but the application refuses to start.
Gives a message that says (freely translated):
Could not start the application because api-ms-win-crt-runtime-11-1-0.dll is missing. Try to reinstall...
I have uninstalled and reinstalled according to this KB article:
https://www.smartftp.com/support/kb/pro ... f2596.html
That does not help. Please advice.