One reason the 2015 version is still sought after for older machines is its remarkably low resource footprint: Minimum Requirement Windows 7 (SP1 or higher), 32-bit or 64-bit Processor Intel Pentium 3 or higher RAM 128 MB (though 256 MB+ is recommended for stability) Hard Disk Space 400 MB to 1 GB of free space How to Download and Install Safely
Because the 2015 version is no longer the current flagship, you must take extra care when downloading: Avasthttps://www.avast.com avast free antivirus 2015 download for pc windows 7 32 bit
A comprehensive one-click scan that checks for malware, outdated software, home network vulnerabilities, and performance issues. One reason the 2015 version is still sought
Free Antivirus for Windows 7 | Download & Install Now - Avast home network vulnerabilities
The first scanner of its kind to identify potential security holes in your Wi-Fi or router, such as weak passwords or hijacked DNS settings.
An improvement to WebShield that allows the antivirus to scan encrypted HTTPS traffic for hidden threats without slowing down your browsing.
Automatically identifies outdated third-party applications on your PC, helping you patch security vulnerabilities that hackers often exploit. System Requirements for Windows 7 (32-bit)