Error installing NLTK Python

Nltk itself is os independent, but the Windows msi installer is not, it's specifically for 32-bits pythons. Alternatively, you can use pip to install nltk, which will install the os independent source file. Simply in cmd, type this:

pip3 install nltk
# pip/pip3 doesn't matter only if there's multiple pythons, but if that does not work (command not found) type:
py -3 -m pip install nltk