While the search for EaseUS Disk Copy Portable is high, there are caveats you must respect.
Open EaseUS Disk Copy. On the home screen, select "Disk Mode" to clone the entire drive (recommended for OS migrations).
Why? Because cloning system drives requires kernel-level drivers and low-level disk access. A standard portable app running inside a live Windows session cannot reliably clone the C: drive if Windows is using that drive.
The de facto portable version is the EaseUS Disk Copy WinPE ISO or the bootable USB builder .