Note: Microsoft has officially deactivated the upgrade paths that allowed Windows 7 keys to activate newer versions of Windows, but the keys still function natively on legacy Windows 7 installations. Conclusion: Exercise Extreme Caution
An untouched, official Microsoft ISO will always have a specific hash value. You can use a free tool like HashMyFiles or the built-in Windows PowerShell tool ( Get-FileHash ) to verify your download. Official Windows 7 ISO Hashes (Examples) Windows 7 Edition (64-Bit) Expected SHA-1 Hash Value 6C9058D5438415EAE1A690FE1976D9216C6BE7F1 Windows 7 Professional SP1 0A1770ADD226A1C62A61E57470270447B6544C81 Windows 7 Ultimate SP1 36AE90DEB9D62FE1648C1844D55D4EB011A07B6C parent directory index of windows 7 iso
A header reading followed by the directory path. Note: Microsoft has officially deactivated the upgrade paths