Blue Spatial has three versions. By default the Enterprise version is installed with a 30 day trial. After the trial expires the license will revert to the free Basic version. The button at the top right displays which version you are using. You can click it to get more information. You may request an extended trial by emailing email@example.com.
When purchasing a license you must specify your hardware Id which is visible on the version page. Once your order has been processed a license file will be emailed along with an invoice. You can upload the license on the version page.
The Azure version does not have a trial capability currently. However you can request a private Azure trial instance by emailing firstname.lastname@example.org.