I downloading tutorial_simple_synth_noise.zip on both Windows 7 and OSX. Both report it as not a valid zip file.
I noticed the same. All tutorial zipfiles are corrupt at the new location. As a workaround you can download them from the location as indicated in this post : http://www.juce.com/forum/topic/tutorials-and-api-reference-update :
Unfortunately, this is true of the new tutorials as well, which aren't in the old location.
Thanks for the heads-up guys, we'll take a look on Monday..
here's a list of bad and good zip file download 4:50pm central standard time 12 Nov 2015: