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Yes, you can download a legitimate Windows 7 ISO using the Heidoc Microsoft Windows and Office Download Tool:
https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool
The ISO file must be the same edition as your Product Key. And if your Product Key is on a COA sticker fastened to a computer, you can only use that Product Key to install Windows 7 on that computer. Not only that, but Product Keys for OEM (pre-installed) copies of Windows 7 can only be used to install the same architecture (32-bit or 64-bit) as was originally installed.
The option to select is "Windows 7 (August 2018)" and then pick the version of Windows 7. You can get it in any language, as long as it's English (apologies to Henry Ford).
There are quite a few hoops to jump through in order to get that August 2018 version up to date through January 14, 2020 (the end of Windows 7 support). If you think you'll get this far, read this entire thread (not just the marked answer): https://answers.microsoft.com/en-us/windows/forum/windows_7-update/windows-7-old-updates/02d3b04a-6245-44c4-b9d4-22ee067c4e8c?messageId=89adf124-9e7e-4635-ab95-bf3f76ac7e06