Download here : http://www.jerseyjackpinball.com/support/
What I do for a delta update on my pc. Download it and place on desktop, appears as a zipped file. Put a USB memory stick into my computer and format to fat32. Then left click the file once, right click and select from the menu extract All and send to the USB stick.
When done go to the Hobbit with the game turned on. Open the coin door, insert the USB stick into the USB cable on the left side of the cash box. Go to Utilities - USB update - do what the screen says.
It should say "Updating" and then a little later the screen may go black - LEAVE IT RUN - DO NOT TURN GAME OFF. When it is done the game will reboot. Then unplug the USB stick. Close the coin door. Play and enjoy your game.
LTG : )
Disclaimer - If you turn the game off during update, then you get to learn about Unetbootin, full install. Time consuming type stuff.