This is not available on official sites. It is usually found on enthusiast forums or provided on the discs that accompany aftermarket cables. Installation Guide for VCDS with a Loader
VCDS (VAG-COM Diagnostic System) is a powerful, dealer-level diagnostic software for Volkswagen Group vehicles (VW, Audi, SEAT, and Škoda). While the official software is maintained by Ross-Tech, many users searching for a "VCDS Loader" are typically looking for a way to use the software with third-party or older "clone" interfaces. What is a VCDS Loader? Vcds Loader Download
If you have an older or simple interface, VCDS-Lite is a free, limited-functionality version provided by Ross-Tech. This is not available on official sites
Assist in flashing firmware to specific chips, like the ATmega162, found in many aftermarket interfaces. Where to Download VCDS While the official software is maintained by Ross-Tech,
For a safe and functional experience, it is highly recommended to use official sources.