The PCSX2 Archive on GitHub contains older legacy builds. Quick Installation Tips PS2 Emulator PCSX2 Setup Guide
The official PCSX2 Downloads page is the safest place to get the latest builds. Download pcsx2 2731 windows 64bit AVX2
Modern builds automatically include 64-bit AVX2 support by default. The PCSX2 Archive on GitHub contains older legacy builds
Use the search or scroll through the tags to find the specific build number you are looking for. Download pcsx2 2731 windows 64bit AVX2