There was an issue with the data file displaying an expiry error message.
This has been resolved. If you downloaded the student files prior to September 25, 2017, please download a new set of the student files from www.ccilearning.com/data. Note that images in the course book that show inventory items will differ slightly from what you see on screen; however, the exercises can be performed correctly as written.
If you are a teacher and downloaded a set of the Teacher Resources prior to September 25, 2017, please download a new set of teacher resources from http://www.ccilearning.com/teacher-resources.