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: 147 today, 332 yesterday, 2,808 this month, 7,336 last month, 1,257,755 total System Hits: 98,831 today, 316,238 yesterday, 6,528,671 this month, 9,610,425 last month, 1,824,128,394 total