Problems applying license to Enterprise Browser runtime

My client is moving from MC3190's running Pocket Browser 2.x applications to the new MC3200 running Enterprise Browser.  We have installed Enterprise Browser Windows IE Persistent as this appears to offer full backwards compatibility with the older Pocket Browser.  So interested if I have made the right choice there.

 

So that is the background and now my real problem starts when attempting to add the license key to the MC3200.  We have purchased licenses and wish to apply these so they are persistent across a reboot.  I have tried loading via .REG file and Enterprise Browser CONFIG.XML file but both methods do not appear to be recognised by Enterprise Browser as I keep getting the demo license prompt.  Are there any tricks to apply the license key?

 

I am just using the default CONFIG.XML file.