Finding a direct "Windows 10 system repair disc download 64 bit" ISO from Microsoft is a common point of confusion because Microsoft does not provide a standalone "repair-only" ISO file.
This is the most flexible option. The official installation media acts as a 64-bit system repair disc and can be used on any PC, not just the one where it was created.
If you specifically need a disc (not a USB) and still have access to a working Windows 10 PC, you can create one without downloading a large ISO. Download Windows 10 Disc Image (ISO File) - Microsoft
Instead, you have two primary options: download the full (which includes all repair tools) or create a System Repair Disc directly within Windows 10. 1. Download Windows 10 Installation Media (Recommended)
Boot from this media and, instead of clicking "Install Now," select "Repair your computer" in the bottom-left corner to access the Windows Recovery Environment (WinRE). 2. Create a System Repair Disc (DVD/CD Only)