Hi James - I can't answer the trial issue - I have heard that offline from others. I hope someone from SAP responds or you can go to SAP Lumira to obtain SAP contact information. I noticed that SAP Store also has a trial version - maybe download it from there?
You can buy your own Lumira license at SAP Store
You can also call the SAP Store at +1-800-872-1727 regarding cloud licenses
Tammy