The Windows 7 ISO represents a bygone era of stability and simplicity, but downloading and using one in 2024 presents significant security risks and legal hurdles. It is currently an "End of Life" product intended only for legacy hardware support or isolated virtual environments.
A common repository for original, untouched ISOs like Windows 7 Professional SP1 .
If possible, do not connect the Windows 7 machine to the internet. Use it strictly for offline tasks or legacy hardware control.