If someone won the prize of the one-year license but they already have a license, does that add one year to the already existing license, or simply give the winner a new license?

For example, my license is valid until October 2024. If I won, would the renewal be pushed to October 2025 or would I get a second license that lasts until only January 2025?

We don't have confirmation from Scirra about that, but i think adding a year onto your existing license makes the most sense.