I had register a new user, but after I clicked the get enterprise trial button, just only got a Download Enterprise trial link, why can’t get a trial studio license?
Studio trial license and Enterprise trial are different. You get Studio trial automatically when you open any Jmix project for the first time. Enterprise trial is an archive with a project which contains trial artifacts of premium add-ons from the Enterprise plan (BPM, WebDAV, Maps, Business Calendar, Notifications).
If you want RAD trial (unlocking Studio features), you need to install Jmix and create your first project. Please refer to the Get started page to make it.
You can also get more information about getting trial in the documentation.