How to get a Serial Key?
First. It is not mandatory to have a Serial Key to activate controller as the Wheel. It could be activated without it. Just keep Serial Key fields as it is and press Activate. Wheel will be activated in standard mode which have all essential settings. 90% of cases could be covered by standard mode.
Serial key is needed only for extended mode, which allows to change some non critical settings and connect additional buttons/axis directly to ODrive. So it is mandatory only for more complex builds.
I want to have extended version. How?
Consider to become a supporter by donating on project development.
Extended functionality comes with extended responsibilities :)