Updating Windows 7 in 2026 can be tricky because official support ended in January 2020. However, you can still bring a system up to the final official security state or even maintain it with community-driven tools.
Use a modern browser (like Supermium if Internet Explorer won't load sites) to download the Legacy Update installer.
Run the installer. It will automatically install missing prerequisites like SHA-2 code signing support and Servicing Stack Updates .