Just a heads-up folks, Already today I have seen updated releases of 360 Total Security, Avira, and Bullguard, all apparently updated to support Windows 10 1803. One thing interesting, however, is that I am running all three of these products on 1803 right now with no problems; I'm sure the changelogs will be provide a lot more details as they become available. I have NO doubt that other security software updates will be out shortly.
But KIS does not support Core Isolation. If you enable Core Isolation, or it was enabled by default, then many protections of KIS will not work. If you enable Core isolation, and afterwards you install KIS on top of it, KIS will warn you about the protections that won't work. But if you already had KIS on your system, you do not get a warning.
If you are on Windows 7, this will not affect you at all. It is only Windows 10 pro with april update that has this feature (or windows 10 enterprise with fall creators). If you have such an OS, then you must make the hard choice between core isolation and full KIS functionality.
The Bullguard updates were applied automagicly when I did a "Check for Updates". The standalone installer has also been updated to the new Bullguard release as well.
Comodo Firewall does not support the Core isolation feature of W10 1803 pro. If you have core isolation enabled, and you try to install CFW, you will get warning messages from Windows that various components of Comodo are not compatible.