certutil -hashfile "C:\path\to\Windows.iso" SHA1 Compare with official values from Microsoft documentation. Do not download any pre-compressed “Windows 10 Pro 64-bit highly compressed” ISO from any website, torrent, or YouTube video. They are 99% malware. Compress the official ISO yourself using 7-Zip. If you see a 1 GB or 2 GB file claiming to be a full Windows 10 Pro 64-bit ISO — run a virus scan immediately and delete it.
Select where to save the ISO. File size: ~5.0–5.5 GB . Windows 10 Pro Iso File Download 64 Bit Highly Compressed
Select Create installation media (USB flash drive, DVD, or ISO file) . certutil -hashfile "C:\path\to\Windows
The page will now offer a direct ISO download instead of the tool. Compress the official ISO yourself using 7-Zip
Select Windows 10 Pro 64-bit, confirm language, download.
Run the MediaCreationTool.exe (Admin rights not required but helpful).
Official ISO, still ~5 GB. Method 3: Using the Windows ESD File (Smaller, But Advanced) Microsoft uses .ESD (Electronic Software Download) files that are 30–40% smaller than ISOs.