Install the base VCDS 21.9 software first, but do not launch it immediately after the installer finishes.
You might have an older loader for VCDS 18.9 or 20.4. Why do you specifically need the ? vcds 219 loader updated
Q: Can I use VCDS 21.9 loader updated with my existing HEX-VCDS cable? A: Yes, you can use your existing HEX-VCDS cable with the updated loader. However, ensure that your cable is compatible with the latest software version. Install the base VCDS 21