Sophos Home Installer returns "Unsupported operating system. Sophos Home does not support this version of Windows" message during the installation process.
Why is this happening?
Sophos Home minimally requires running Operating Systems that are still receiving vendor security updates. In rare cases, Sophos may retire support for a specific OS at an earlier/later date if needed.
Please find more details here Sophos Home Operating System Support Policy
What to do?
Please update your computer to a supported operating system - Sophos Home system requirements
Otherwise, you will not be able to install Sophos Home.