Run the installer. It will automatically install missing prerequisites like SHA-2 code signing support and Servicing Stack Updates .
Download and install KB4534310 , the final monthly rollup from January 2020. Summary of Key Updates Update Type Service Pack 1 Baseline for all modern updates. Servicing Stack Updates the update installer itself. SHA-2 Support Allows Windows 7 to "trust" modern files. Final Rollup The last official security patch from Jan 2020. Microsoft Windows 7 Update s
If your Windows Update is "stuck" checking for updates or giving errors (like 80072EFE), community tools like Legacy Update can restore the native Windows Update service. Run the installer
Use a modern browser (like Supermium if Internet Explorer won't load sites) to download the Legacy Update installer. Summary of Key Updates Update Type Service Pack
To save time, install the Convenience Rollup (KB3125574) , which contains years of patches in one file.