1. The license key is valid for a single domain, its subdomains and child application hosted under this domain. The trial message does not appear if you use IP to access the server or you have internal server with host name "localhost"
2. You should have Sitefinity 3.x installations under Downloads section of the account used to purchase the edition you currently have.
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