As trial version you could only get the latest one under: Products & Subscriptions > Trials.
Providing you with a trial license for an older Sitefinity version is beyond my authority and I will need to escalate your request.
Due to the holidays we are currently somewhat understaffed so I beg for your patience while your request is reviewed. We will contact you as soon as we have some progress on the subject.
In advance, thank you for your patience.
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 Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items