17.7.99 is an older, stable release of the "17" series. Note that newer versions are available on the official DriverPack website .

The "piece" or "part" mention in your query typically refers to large software files being split into smaller, downloadable segments (e.g., 500MB or 1GB parts) to make downloading easier and more stable. Quick Overview

Automatically installs drivers (Sound, Video, LAN, Chipset, etc.) without needing an internet connection.