Thanks for contacting us!
Our Community edition does not require license. You can activate it from your Project Manager by going to "Create New Project" then upload your credentials ( Email and Password) and choose "Community edition".
Please, bear in mind that some of the features that are available in the Standard edition are not included in the Community edition and once you migrate your project they will not be available. Further if you have used them in your project ( for example if you have built a Form using the Form builder) using the Standard edition trial this content will not be migrated to the Community edition.
I hope this information is helpful and please, let me know if you have any further questions!
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items