@walt.farrell, seems that it is solved! (and yes, I restarted four times). Thank you!
Hi, I have a problem with the dictionary in Affinity Publisher. I really need Dutch in Publisher. Yes, I read the FAC 'How do I add additional Dictionaries to Affinity Publisher?' The Dutch (Nederlands) language is on my Mac, is selected in system preferences ànd I downloaded and added the Hunspell files to ~/Library/Spelling as proposed in the FAC below, but still it doesn't appear in Publisher. I add some screenshots. I use Mac os 10.14. What could have gone wrong???