Avast Premium Security v21.11 includes the following primary security modules:
Avast Premium Security | Online Security — Up to 10 Devices Avast_Premium_Security_v21.11.2500.7z
The file refers to a compressed archive containing a specific legacy version of Avast's flagship antivirus software, released around late 2021 . As of April 2026, this version is no longer the current stable release, but it remains a notable build for its consolidation of several "Shield" technologies. Core Protection Features Avast Premium Security v21