Downloading problem in speech and keyboard

settings > system > speech > add a language > English (US).

settings > devices > keyboard > add keyboards > English (US).
 
I have the exact same problem. Lumia 635 from Vodafone Ireland with Windows 10 preview. Multiple reset already attempted. It made my Cortana crashes during setup when I need to type my name and after that Cortana crashes all the time :-(
 
It's normal for Preview builds can't download any speech or keyboard packages. Check the Insider website for more details.