Dictionary application needs to download dictionary "Apple Dictionary" before use I'm repeatedly being asked to download the "Apple Dictionary" when I open the dictionary application.


  Dictionary application needs to download dictionary "Apple Dictionary" before use.


This doesn't happen every time I open it. I haven't pinned down specific usage cases where this message appears, but I think it may be every time after I reboot my computer.

Is there anyway for the Dictionary application to remember that I have "Apple Dictionary" permanently? This has only started happening after I upgraded from OS X Mountain Lion to macOS Sierra.
The Apple Support article “How to free up storage space on your Mac” mentions:


  Other ways that macOS helps automatically save space
  
  macOS Sierra and later automatically takes these additional steps to save storage space:
  
  
  Detects duplicate downloads in Safari, keeping only the most recent version of the download
  Reminds you to delete used app installers
  Removes old fonts, languages, and dictionaries that aren't being used
  Clears caches, logs, and other unnecessary data when storage space is needed
  


While the article says “dictionaries that aren't being used”, I have the impression even recently used dictionaries get deleted if free drive space gets low.

I find this “feature” terribly annoying, as I’ve already found myself unable to consult Dictionary.app a few times while offline, but I’m not aware of any way to turn it off.