I got the activation dialog and introduced the key I got from my profile.
Then I was able to design a Windows Form, but not to run it (before I changed anything it worked), giving the error above.
Now I created a new project and I couldn’t grab anything to the Form, giving the next error:
Failed to create component ‘Bunifubutton’. The error message follows:
‘Microsoft.DotNet.DesignToolsServerException: This product does not have a valid Bunifu UI WinForms license to run.’ […]
Thank you for your help