The zip archive is missing the vm code that needs to be translated into assembly in project 08.
The code is available from
http://www.nand2tetris.org/08.php in pop-up windows, so the problem isn't
insurmountable, but it's awkward to cut and paste from the windows, and on my OS/browser combination I lose the line breaks when I do so. It would be more convenient if the code was provided in the .zip file.
For a few of the .vm examples such as FibonacciSeries.vm (which should be, but is not, in projects/08/ProgramFlow/FibonacciSeries/), it would be a useful exercise for the student to write the .vm file, if a good enough description of what the program should do were provided. So, providing such a description of the file in the zip file or even on the Web page would be an alternative.