Free trial requests activation key (no "continue" button, will not run if I close the window)

I had Trados 2019 on my computer and downloaded the free trial of Trados 2021. When I open it, I am asked for a license key, which of course I don't have. Every answer to this question says to just click on "continue" but there is no such button in the window. If I close it, the entire program closes. I've never had Trados 2021 on my computer before. I need to use this software urgently for a product but do not want to commit to buying a license until I am sure I like it. Please help!