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: 318 today, 258 yesterday, 2,846 this month, 6,468 last month, 947,271 total System Hits: 76,025 today, 139,364 yesterday, 2,529,646 this month, 4,104,428 last month, 1,588,165,743 total