Intel Pentium 4 / AMD Athlon 64 or above (must support SSE3 instructions).
Required for downloading, activating, and maintaining the antivirus database. Mac System Requirements avast internet security system requirements
The software utilizes a "Background Scanning" feature that prioritizes tasks only when the computer is idle. Therefore, even if you are on an older machine with an older processor, Avast is generally safe to install without slowing your system to a crawl. Intel Pentium 4 / AMD Athlon 64 or
32 or 64-bit, excluding RT and Starter Editions. excluding RT and Starter Editions.