The link to the zip-file with the examples is dead.
On this site: http://archive.fabacademy.org/archives/2017/doc/electronics_design_eagle.html
Link text in bold:
" Step 2. Sample Echo Board Schematic / Board

Example Files to Start From
To help you along, you can download the Hello Echo schematic and board files. You can then add the necessary components to the schematic in these example files:
Board Hello Echo and Schematic"

I have attached my attempt at recreating the missing file.
good_day_board.zip

I think there is something broken with the link