Dorico SE for Mac

Help me,

Dorico ask me a licence, but Dorico SE doesn’t is it free?

Yes, it is free, but in order to receive the free license, you need to register with Steinberg.
Go to the page https://new.steinberg.net/dorico/se/ and click on the field DOWNLOAD FOR FREE.
That leads you to a page where you can create a Steinberg ID. If you register with your e-mail address, an activation code will get automatically sent to you.