Important Note: Officially, Microsoft never released an "Office Service Pack 3" for Windows 7. The final official service pack was Service Pack 1 (SP1). However, because Windows 7 remained popular long after its prime, the community often refers to the "Convenience Rollup" (released in 2016) or unofficial community-made packs as "Service Pack 3."
Windows 7 Ultimate x64 With USB 3.0 + Updates - Internet Archive windows 7 service pack 3 download 64-bit offline iso
You cannot simply copy the ISO file to a USB drive; you must extract it. Important Note: Officially
There is no Windows 7 Service Pack 3