Searching for "index of" combined with "parent directory" is a common advanced search technique used to find open web directories containing downloadable files like Windows 7 ISOs Spiceworks Community Finding Windows 7 ISO Directories
The following links lead to open directory listings where you can navigate folders to find specific editions (Home, Pro, Ultimate) and architectures (x86/x64): parent directory index of windows 7 iso install
Here is what you need to know about finding a clean install file today. Searching for "index of" combined with "parent directory"
en_windows_7_professional_with_sp1_x64.iso
3.19 GB – The professional’s choice. No bloat. Just msconfig and a will to live. Verified checksums
— The crown jewel. 3.1 gigabytes of pure, translucent-windowed potential. win7sp1x86.iso
Lack of Verification: Open directories rarely provide the original cryptographic hashes required to verify the file has not been tampered with.