Try below code. It has downloaded package as expected
import nltk
import ssl
try:
_create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
pass
else:
ssl._create_default_https_context = _create_unverified_https_context
nltk.download()
Looks before link was broken whicvh been fixed by ssl.
Note :- MAC been used