How to install the latest version of DirectX - Microsoft Support
It will ask for a location to extract the files. Create a new folder (e.g., C:\DXTemp ) and select it. Open the folder where you extracted the files. Locate and run DXSETUP.exe . Follow the prompts to complete the installation. Verifying Your Current DirectX Version directx 12 windows 10 64 bit offline installer link
no standalone offline installer for DirectX 12 on Windows 10 because it is an integral part of the operating system How to install the latest version of DirectX
Unlike DirectX 9.0c or earlier versions, DirectX 12 is not a stand-alone package that you download and run. Instead, it is a core system component deeply integrated into the Windows 10 operating system. directx 12 windows 10 64 bit offline installer link