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>>> import nltk
>>> nltk.download('vader_lexicon')
[nltk_data] Downloading package vader_lexicon to
[nltk_data]     /Users/liling.tan/nltk_data...
[nltk_data]   Package vader_lexicon is already up-to-date!

Or on terminal:

$ python -m nltk.downloader vader_lexicon
[nltk_data] Downloading package vader_lexicon to
[nltk_data]     /Users/liling.tan/nltk_data...
[nltk_data]   Package vader_lexicon is already up-to-date!

You may try the following command in command prompt/terminal

python -m nltk.downloader vader_lexicon

Output for Windows:

[nltk_data] Downloading package vader_lexicon to
[nltk_data]     C:\Users\username\AppData\Roaming\nltk_data...

It will download only the specific package to nltk_data folder.