You cannot. The software is free to download , but it requires a paid license (embedded in the genuine interface). Without the interface, the software operates in demo mode.
If you are currently on 18.9.1, Ross-Tech recommends updating to the latest current version for free. The newest releases include support for and modern security protocols like SFD unlocking , which 18.9.1 lacks. vcds 18.9.1 download
Note: You cannot download the official software without a valid account linked to a genuine cable serial number. You cannot