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: 477 today, 445 yesterday, 4,160 this month, 15,882 last month, 1,339,275 total System Hits: 321,607 today, 341,057 yesterday, 3,413,778 this month, 10,457,921 last month, 1,889,012,519 total