This is a free non-commercial version which can be set to update automatically. However to get complete coverage you will need to upgrade to the paid for version. This means that if you run the free one you will have to run Malwarebytes and Stinger etc occasionally if you are to be safe.
Site Hits: 263 today, 332 yesterday, 6,251 this month, 13,129 last month, 117,945 total System Hits: 23,318 today, 67,978 yesterday, 1,402,428 this month, 4,080,574 last month, 1,526,371,190 total