To enter the license code on a Windows 10 PC or tablet you'll first need to find the "Enter Win2PDF License" app from the Windows 10 Start screen. You can either locate it visually as a tile on your Start screen, or you can use the Search charm to find this application. Here is a short video showing how the "Enter Win2PDF License" app is used to license your copy of Win2PDF.
How to license your copy of Win2PDF in Windows 8
Once you start the "Enter Win2PDF License" app, the following window will appear.
Click on the "Enter license code" button, and enter your name, company, and license 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.