Euro Truck Simulator (ETS) does not have a version 13, as the current major release is Euro Truck Simulator 2
: If you need to activate a legacy copy without an internet connection, you can use the official offline activation page Euro Truck Simulator 2 Version history euro truck simulator 13 activation code and email link
They only need a code and a link.
The website tells you that the code is ready, but you must complete a "Human Verification" survey. These surveys ask for your phone number, credit card info, or ask you to download a mobile app. Euro Truck Simulator (ETS) does not have a