The package on disk is created in version 9.12.1, you first need to open the package with a studio pro version between 9.18.0 and 9.24.x to automatically convert it. Afterwards you are able to open it with 10.10.
It would be more helpful to update the file "Scrumptious_Start" in the tutorial to avoid this issue.
Unfortunately, I'm using Studio Pro on Mac, so I can't fix the problem as only version 10.7.0 and later are available to me.