Some counterfeit interfaces may try to “phone home” and trigger license checks. For genuine Ross‑Tech interfaces, internet access is perfectly fine.
VCDS 18.9 remains a benchmark for DIYers and professional technicians because it provides "dealer-level" access to a vehicle's electronic control modules.
Unofficial download packages bundled with aftermarket drivers frequently carry malware, trojans, or viruses. Always scan downloaded files with a reputable antivirus before running them. Step-by-Step Installation Guide
VCDS 18.9.1 is a legacy version of the Ross-Tech diagnostic software for VW, Audi, Seat, and Skoda vehicles. While originally released around late 2018 to support 2019 model year cars, it is no longer the current version.