Registering Key Not Showing

Recieved the email with link and code to download Cubase 9 Pro Trial. Downloaded and installed full program, launched eLicenser control centre, no licence showing. Registered soft eLicenser on MyProducts page to no avail. When I use eLicenser control centre to activate the trail, I get a message saying no USB eLicenser is available. I thought the trial could be installed without a USB dongle, and for a trial I see it unreasonable to spend £20 on buying a dongle