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: 115 today, 63 yesterday, 248 this month, 221 last month, 732,108 total System Hits: 103,404 today, 97,670 yesterday, 1,516,353 this month, 3,146,087 last month, 1,535,522,203 total