It is normal for the tutorial project files themselves to not be named incrementally.
The tutorials themselves are text based tutorials that can be found under Help > Help Topics. Not all of them have a companion project to go along with the instructions however. So, in the case of many Cakewalk products, only tutorials 1, 4, 5 and 8 have actual project files to go along with them. The other tutorials do not.
Find answers to questions about Cakewalk products.