What is Speech Downloader?

Its a program in your Mac for Siri updating the Voice to text function

See image below:

Found a solution here. https://discussions.apple.com/thread/7696701?start=0&tstart=0

Need to go to System Prefs > Accessibility > Speech > System Voice (drop down) > Customize. Then uncheck any voices in the list that have a "Upgrade to enhanced quality" check box next to them.