Update: The files seem to be available now.
Just a word of warning about the new Official Guide.
You must use an access code from the book to download the audio files and software. The code can only be used two times.
If you enter the code right now, you will get a message that the downloads are not ready. That will count as one use of the code. If you enter the code again tomorrow and the files are still not ready, that will count as a second use of the code.
After that you will have no more uses left. You will not be able to get the files.
I will try, somehow, to get confirmation of when it is safe to use the download code.