Older third-party (or even genuine) interfaces, particularly those based on the now-obsolete HEX-USB or KEY-COM designs, stop working with newer VCDS releases (versions 19.x and above). Ross-Tech periodically drops driver support for outdated hardware. Installing a newer version will result in a "dongle not found" or "interface not supported" error.
If you are working on a Corrado, a Mk3 Golf, or an early Audi A4 that uses the purely K-Line communication protocol (and not CAN-Bus), you might need very old software (Versions 3.x vcds old version download
If you are searching for there is a 90% chance you own a clone (counterfeit) cable . These are the $20-$50 cables sold on eBay, AliExpress, or Amazon. If you are working on a Corrado, a
Using a counterfeit cable violates Ross-Tech’s intellectual property. Moreover, old cracked versions often contain malware, keyloggers, and viruses. old cracked versions often contain malware