GameGuard error "Windows 10 LTSB / LTSC is using outdated kernel"
If you receive an error with a message of "Your Windows 10 Enterprise 2016 LTSB system is using outdated kernel 10.0.14393, please, install all latest Windows updates" while trying to play on a FASTCUP.NET matchmaking / tournament platform for the CS 1.6 and CS:GO games using the GameGuard anti-cheat, and the error message contains the words LTSB or LTSC, this means you are using an LTSC/LTSB version of Windows which is intended to be used by enterprise users but not to be installed by common users on their personal computers, since that version of Windows cannot receive some security updates that are required for the anti-cheat to work.
The best you can do is to make a clean install of regular Windows 10 without any modifications or tweaks: