GDS VCI Diagnostic Tool provides comprehensive diagnostics, analysis, and reprogramming for most Hyundai vehicles from 1996 to present, including hybrids. It offers a large library of technical and repair information. To install GDS VCI, users must first install the Hyundai and Kia DVDs and programs like Microsoft Word Viewer 2003, Adobe Reader 8, and Visual C++ 2008 by following the provided steps and entering the dealer code. A video link is also included to demonstrate the installation process.