Is it a Single app. licence or its part of Creative Cloud subscription?
If its a Single app. licence please follow the steps mentioned in this KB doc. Download and install Lightroom 6 (Single App license).
Else if its part of CC Subscription please follow this link Digital photography software | Download free Adobe Photoshop Lightroom CC trial to download it.
I am just wondering how you will send a download back...?
[topic moved to Lightroom forum]