Avira free security suite 2018 (former avira free antivirus) is the best free protection you can have. avira is regularly the winner of independent tests (av-comparatives, av-test) in detection, false positives and performance.. Where to download avast free antivirus 2018: the latest version (17.7.3660) of avast free antivirus 2018 is available for download in both 32 bit and 64-bit forms (setup installers). choose the one suiting your needs and click the download button below.. Ng