The macOS dictionary app cannot add new build in dictionaries

Yes it works. A, the file name has to be changed to another name like Portuguese - English2.dictionary, with a "2" added here. B, reopen the dictionary and preference, scroll down to the bottom of the list. Check the newly added dictionary.

Correct, they guide though basic steps, including MacOS reinstall. However, if it doesn't resolve the issue, they still work on the case. The next step is to schedule a call with your local phone support engineer, do remote session, get screen capture, collect the logs and file a case with engineering and then do regular follow ups. At least it works like this in US.

For now, you can simply go to

/System/Library/AssetsV2/PreinstalledAssetsV2/InstallWithOs/com_apple_MobileAsset_DictionaryServices_dictionaryOSX

Find the dictionary you need, and delete the corresponding folder.

Then, reopen the dictionary app and choose the language.

The app will automatically re-download all the stuff you need.

It turns out that all you need to do is delete everything in the following path:

/System/Library/AssetsV2/PreinstalledAssetsV2/InstallWithOs/com_apple_MobileAsset_DictionaryServices_dictionaryOSX

When you reopen the Dictionary app afterwards, all the dictionaries will become selectable, and the app will automatically download the dictionaries selected.

Thanks all the guys, I finally fix the problem, by the way, there is a tip for newbie (as I am), if you can't find /Library/ folder in your <user> folder, just open finder, and press option button then click go to, the library will show up.

Thanks at all

Thank you for pointing out the problem. I also have this problem with my 16" Macbook pro on the brand new build that came with the computer. As of February 2020, no fix has been provided by Apple. I hope this issue gets the attention it deserves.

Not sure I did it right as I’m not 100% sure what you mean by /Users/<user> but it did not work. Here is what I did, please correct me where I went wrong.

Finder/Home Folder/Menu Bar> Click Go> Hold down option key> Library appears> Click Library> Dictionaries>CoreDataUbiquitySupport folder removed to trash.

closed Finder > opened Dictionary>Clicked on preferred languages> closed Dictionary

but the languages do not go into dictionary. Right clicking or highlighting a word brings up a window that reads...

No Local Dictionary Available

configure dictionaries

if I click on that and try to sent languages nothing happens.

My system does not have the file you and others are suggesting, how can I fix that.

Catalina 10.15.4

I had the same problem with my new 16in MBP. I hope Apple can fix this ASAP.

I have the same problem on MBP 16" running 10.15.1.

I've updated my late 2013 15" MacBook Pro and all the dictionaries work, so this isn't a 32 bit vs 64 bit issue.

Unfortunately, the supplemental update does not fix the issue.

I have exactly the same problem. I hope it could be fixed asap

Thank you, scheeko. You are the best!

Happy Thanksgiving!