If your Windows 7 system claims wusa.exe is missing, run a System File Checker scan immediately. Do not download the file from any website. If you are still using Windows 7 on a machine connected to the internet, consider upgrading, as Microsoft no longer provides security updates for that operating system.
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You should rarely need to "download" wusa.exe as a standalone file. By using the or the System Update Readiness Tool , you ensure you are getting a genuine, digitally signed version of the file straight from Microsoft’s architecture. If your Windows 7 system claims wusa