Wind Waker's cutscenes freeze in Dolphin Emulator 3.5
Solution 1:
Try to disable Audio Throttle
If you have an older version
you can find it in DSP (Sound settings) and uncheck it.
If you have a newer version
that option has been moved to the frame limit drop down menu in config. Make sure it's not selected.
Source
If this don't work, download the image again and try it, that can also be the source of your problem.