(Updated: 8/15/17): The Edge web browser has recently made updates that are no longer allowing the PDF to download and view directly after generating it. Here's how to get around it and download the PDF itinerary:

1. Press "Send to Clients", then choose the "PDF" option. Click "Generate the PDF". 

2. Once the button turns green and says "Done! Click to Download" - instead of clicking, you will want to right-click the button "Done! Click to Download". 

3. Once you right-click the button, choose the option to "Save Target as".