Can't activate emClient

I have purchased a new computer and put emClient on it.  When I tried to enter the license number it says I have reached the number of licenses when we haven’t.  Can you please look into this as I really need to have emclient working.  Details are - Michael Sansom, Electrical Results, Issue Date- 28/10/13,  Activation key - f7b06ef7-18e0-451d-8ca6-f92e9f47cc4b.  It could be that I have the wrong activation key maybe.  Please tell me how to fix this.