Go to the official Rufus website to download the portable version. This tool will format your USB and copy the ISO files correctly. Run Rufus: Insert your USB drive. Open Rufus and select your USB drive under "Device." Click "Select" to choose the Windows 7 ISO file.
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Because official links are buried, most users turn to third-party archive sites like Softlay, Uptodown, or GetIntoPC. Go to the official Rufus website to download