Often times QuickBooks updates the system to improve particular features. With that being said, the option to download trips within the Mileage menu has been moved to a new location on the screen.
If you go to the Add Trips drop-down menu, near the ride side of the "Mileage" page/menu, then you'll be able to see Download Trips. After you download the trips you need, you can print them. Here's a visual below:
This should do the trick. If you have any other trouble within your account, don't hesitate to come back!