It's quite a challenge to find legitimate sources for older software like Windows 7 Pro OA, especially since Microsoft has discontinued support for it. However, if you have a valid product key, you can still download Windows 7 ISO files directly from Microsoft's Software Recovery page. This is the safest route as it ensures that you're getting an unmodified version directly from the manufacturer.
First, visit the Microsoft Software Recovery website and be prepared to enter your product key. Once verified, you will be able to download the ISO file directly. Remember that downloading Windows from other third-party sites can be risky and might expose your system to security vulnerabilities or malware.
After downloading, produce sure to use tools like Rufus or the Windows USB/DVD Download Tool to create a bootable installation media. As for compliance with licensing regulations, using your existing valid license key should keep you on safe ground as long as it’s being used in accordance with Microsoft’s terms. Always ensure that your usage aligns with their licensing agreements to avoid any legal issues.
If for some reason this method doesn't work due to the discontinuation of direct downloads for Windows 7 by Microsoft, another legitimate avenue would be contacting your computer's manufacturer if it came originally with Windows 7 Pro OA installed. They might provide recovery media though there could be a cost associated with this service.
