After you have received a license code through email, you can enter the Win2PDF license code by running
"Start->Programs->Win2PDF->Enter Win2PDF License". The following window will appear.
Click on the "Enter license code" button, and enter your name, company, and registration code exactly as they are listed in your email receipt.
If you entered the information correctly, you should see a success message as follows.
New documents created by Win2PDF will no longer include the trailer page on each document.