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: 38 today, 0 yesterday, 1,200 this month, 824 last month, 34,439 total System Hits: 97,923 today, 132,325 yesterday, 3,167,625 this month, 4,104,428 last month, 1,588,803,723 total