Wyse Device Manager Licence?

I'm having problems with Wyse Device Manager ... we only have 10 thin clients on site (it's a trial to see if we will buy more in the future) and I wanted to manage them using WDM.  However the first time I downloaded and installed WDM I installed the "Enterprise" version.

I realised my mistake later on and uninstalled the Enterprise version, and installed the Workgroup version.   Unfortunately even after instaling workgroup I keep getting the popup at launch saying I am unlicenced and on a trial of 30 days?  Now the 30 days as expired and I cannot use WDM  :(

Is there any easy way to change the software back to workgroup licence?  I was in the process of building images and experimenting with script builder.