Can I develop with a Sitefinity 4.x trial license?
Yes, you may develop your project with the 30-day trial of the respective Sitefinity 4.x edition that you plan to purchase. After your trial period expires, you need to purchase a license in order to continue with your development. After you purchase a license, you can apply the new license file to the trial project and continue with your development and project launch. For more details on how to apply the license key to your Sitefinity project, please refer to the “Activating a license” section of the Sitefinity 4.0 Documentation.