I have same problem, Windows Server 2012 R2, after clean install KART_for_Business_6.1.0.90.0.11874658.0_en-US.exe the kl_gui.exe show icon and close, I had reboot OS, reinstalled but problem persists.
Could you provide a link to latest version 6.0.0.xxx?
https://drive.google.com/uc?id=1PE8e84vTA5p7z8xti5FIYWMUF7CYxkis&export=download