A feature of most of our programs is their ability to update themselves automatically. If you are connected to the Internet, virus database updates are downloaded and installed automatically without any user action.
Best free antivirus for Mac: Avast Free Mac Security Many antivirus suites provide a decent level of protection, but a few rise above all others by providing the very best in performance. Avast Security (for Mac) delivers effective malware protection along with unusual bonus features. It tanks our antiphishing test, but this free utility is still worth a look.
The availability of a new version is checked when an Internet connection is established, and every four hours afterwards. Update files can also be downloaded from these pages if required e.g. If your computer does not have an Internet connection. Updates are usually released on a daily basis.
Note: No reinstallation of the program is needed for virus database updates!