Before you can install the big Convenience Rollup, you must update the "Servicing Stack." This is the component of Windows that actually installs updates. If this is outdated, the larger rollup will fail.
Convenience Rollup (KB3125574) from the Microsoft Update Catalog. 4. Final Security Rollups (To 2020) update windows 7 sp1 to sp3 offline
After updating offline to the January 2020 level, Windows 7 is still unsupported . No new security patches exist. If this PC connects to the internet afterward, it will be vulnerable to malware and exploits discovered after 2020. The offline update method is best for: Before you can install the big Convenience Rollup,
There is no official Windows 7 Service Pack 3 (SP3); Microsoft only ever released Service Pack 1 update windows 7 sp1 to sp3 offline