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| | Source | Version / File | Notes | | :--- | :--- | :--- | :--- | | VCDS Software | Ross-Tech's Official Archive | VCDS-Lite 1.2 | This is the updated, official version for non-CAN vehicles. It's best for Windows 10. | | FTDI Chip Drivers | FTDI Chip's Official Site ( D2XX Drivers , VCP Drivers ) | Latest D2XX or VCP | Use these if your cable has a genuine FTDI chip. The VCP driver is essential for COM port assignment. | | CH340/CH340G Drivers | WCH's Official Site | Latest USB-to-Serial driver | This is the go-to source for cables with the clone chip. | how to install vag kkl 4091 on windows 10