Thank you for choosing Sitefinity CMS!
You are not obliged to set the domain name right now. What you can do is log into your account and download the license key file that you will find there. You can then apply it in the project creation process and you should be able to develop your project on localhost with no issues.
If you have any further questions, please do not hesitate to get back to us at your convenience!
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items