I get the following error when trying to install Punkt for nltk:
nltk.download(\'punkt\')
[nltk_data] Error loading Punkt:
First go to the path /Applications/Python 3.6/ and run Install Certificates.command
You will admin rights for the same.
If you are unable to download it, then as other answer suggest you can download directly and place it. You need to place them in the following directory structure.
> nltk_data
> corpora
> brown
> conll2000
> movie_reviews
> wordnet
> taggers
> averaged_perceptron_tagger
> tokenizers
> punkt