If you are going to keep things in the sasuser.v94 folder (which is notwhat the instructions recommended - they recommend having the data in a folder called cert), then your %LET statement would have to change. Or you might have copied things just to a cert folder in which case folders/myfolders/practice-data/cert(if you copied the entire zip archive folder structure) The structure in your zip archive might be Having all the files contained in one folder makes it easier to find them together in one place. You should put all the files from the zip archive in your shared folder location - preferably in a folder because the program you need to run will create all the data in the location your specify.
If you are using SAS University Edition, then this is the %LET statement you would use (assuming you put all the files from the cert folder in the zip archive into a cert folder in your shared folder location).
The original cre8data.sas file shows this %LET statement: Are you getting error messages in the log?
Your %LET shows a 'cert' subfolder, but your screen shot does NOT show that subfolder.
