Open EQ7.
Select the middle tab - Open an Existing Project
The list will contain all the projects (.pj7 files) in your default directory.
The file InklingoPOTCR.PJ7 should be there.
Select. And begin playing.
If, by chance, it's not listed, there is an OPEN FILE ICON at the bottom which will allow you to search other directories on your hard drive - the project was probably saved elsewhere when you downloaded the file.