You must exercise extreme caution when searching for a "DirectX 12 standalone .exe" online. Third-party sites offering a direct setup file for DirectX 12 frequently bundle malware, adware, or spyware.
Download the latest offline driver package for your graphics card (NVIDIA, AMD, or Intel) using a connected device. directx 12 windows 10 64 bit offline installer
If you are trying to resolve a specific issue on your PC, tell me: You must exercise extreme caution when searching for
Use the Deployment Image Servicing and Management (DISM) command-line tool to install the "Graphics.Tools" capability offline. How to Fix DirectX 12 Errors Offline If you are trying to resolve a specific
If you have internet access, using the web installer is faster than the full offline package. Download the DirectX End-User Runtime Web Installer. Run dxwebsetup.exe . Follow the steps to install necessary updates. How to Verify Your DirectX 12 Installation