After you download and install DirectRT, open the program by double-clicking on the DirectRT.exe file or any shortcuts that you created during the installation process. You will see a box in the center of your screen that has a 15 character code beginning with a D. Send that code and a message asking for trial code authorization to service@empirisoft.com. You will receive an email that has a 6 digit number. After you open DirectRT and see the same box as before, enter the 6 digit number in the bottom box that has a 0 in it. This will give you access to DirectRT.