The genuine 2015 full offline version comes as a ZIP or ISO file around 11.8 – 12.4 GB. If you see a 2 MB "downloader.exe," that is NOT the offline full version.
The core appeal of the DriverPack Solution 15 Offline edition is its independence. Unlike the online "web" installers common today, the offline full version contains several gigabytes of driver data compressed into an ISO or executable format. This makes it an essential tool for environments with limited connectivity or for older hardware that lacks modern manufacturer support. Driverpack Solution Offline Free Download Full Version 2015