True incremental updates of size under 100 KB are available at least twice a week and within couple of hours in the case of emergency of new virus. avast! automatically checks for new updates - downloads, installs and loads them without restart or logoff. Program upgrades are available time to time, they are incremental too (about 300 KB).
avast! Free Antivirus is available in English, French, German, Italian, Japaneese, Polish, Portuguese, Russian, Spanish and other languages - check http://www.avast.com/eng/down_home.html to download avast! in your language.
Note: FREE registration is required after 30 days. A FREE license key is easily obtained from the convenient registration form within the program interface.