Download the latest Komplete Kontrol driver (v392)
Extract the zip file
Right-click on "Komplete Kontrol Driver Setup PC.exe" and choose Trouble-Shoot Compatibility.
Select the lower option "Trouble-Shoot Program"
Select the option "Program Worked In An Earlier Version Of Windows"
Click Next and select Windows 8... and complete the process
Now run "Komplete Kontrol Driver Setup PC.exe"
It may want to uninstall the existing driver... let it do so.
Run "Komplete Kontrol Driver Setup PC.exe" again... and it'll install the driver.
The driver will now be installed... with no yellow exclamations in Device Manager.