Change the to an unused port between COM1 and COM4 .
VAG-COM 409.1 and VCDS-Lite only support COM ports 1 through 4. Windows 10 often assigns higher numbers by default. Installing and Registering VCDS Cable or VAG-COM how to install vag kkl 409.1 on windows 10
Open the software, go to Options, select the COM port you assigned in Step 4, and click Test. Troubleshooting Common Issues Change the to an unused port between COM1 and COM4