Two common causes:
1) No active license
Internet Security needs an active license to fetch the latest threat databases. Without current updates, we can’t provide real-time protection, so the toggle stays off in unlicensed/expired states.
What to do: Activate your license in the app. If you already have one, re-enter the key or refresh the license status, then try enabling Internet Security again and restart the PC. If it still won’t enable, contact Support.
2) Unsupported Windows version
Internet Security requires Windows 8 or later. It doesn’t work on Windows 7/XP/Vista, so the toggle stays off.
What to do: Use the other protection modules available on your system (e.g., On-Run protection, startup scan, scheduled scans), or upgrade Windows to a supported version to use Internet Security.