For those on a budget, Windows 10/11 offers more features and better security than Windows 7. Microsoft sometimes provides deals or upgrade options.
Instead of running an obsolete and potentially compromised operating system, the most secure path is to use a modern, supported operating system.
Windows 7 Ultimate with SP1 x64 is a popular operating system that was widely used in the past. The 677299.iso file you mentioned seems to be a specific build or version of the Windows 7 Ultimate with SP1 x64 installation media.