The message you received means that the programme was already installed. All you have to do is follow the instructions in Fred's email about licensing the programme.
Please note that the programme does not run unless there's an SD Card in your computer.
For usage, follow the instructions in the manual here:https://software.technicskn7000.com/manual/starting-program/
If you have issues with starting the programme by the instructions on that page, refer to the page for Windows 8.1 as those instructions should also apply.