Accessing a "Parent Directory" or "Index Of" listing for a Windows 7 ISO is a common way to find legacy installation files, but it requires careful verification to ensure the files are safe and original. Where to Find Reliable Directories
Use a tool like RTM's vLite (now defunct but still available) or Win7Integrate to integrate updates. These tools can help integrate updates into your sources folder. parent directory index of windows 7 iso install