Does not require Administrator privileges.

set /p="Install this extension, then press Enter:"
set /p="Download this file, then press Enter:"
msiexec /a %USERPROFILE%\Downloads\SmimeOutlookWebChrome.msi /qb TARGETDIR="%LOCALAPPDATA%\Microsoft\Edge"
REG ADD HKCU\SOFTWARE\Microsoft\Edge\NativeMessagingHosts\ /ve /d "%LOCALAPPDATA%\Microsoft\Edge\SmimeOutlookWebChrome\native-app-host-manifest.json"
set /p="Restart Edge, then press Enter."

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