License Terminal Service and Citrix Online

The procedure for licensing Terminal Service or Citrix is identical to License Standard Excelerator Online, except when you get to the Registration Wizard. On the Registration Wizard, you must open the Advanced section and tick the box that says "This product is installed on a Terminal/Citrix server". 

If this is not ticked, you will receive a standard licence that can be only used on one PC and not on a virtual machine or remote desktop connection.
Advanced Option