All updates and patches for Direct X will be applied through Windows Updates.
When trying to play Fortnite (or a game such as PUBG or ARK), it is not uncommon to receive the following message: DX11 feature level 10.0 is required to run the engine If you get this message, there is no need to panic.
Direct X is a set of Application Programming Interface developed by Microsoft to run on the Windows and Xbox based systems.
What Direct X does is that it creates an efficient medium between the graphic intense programs like games and the hardware like graphics processor that are needed to run those programs.
As we have mentioned, for Windows 10, the latest Direct X version is Direct X 12.
For more info about Direct X 12, read: To update your Direct X 12, simply turn on your Windows Updates.