How to install NLTK modules in Heroku
You need to follow the below steps.

nltk.txt needs to present at the root folder
Add the modules you want to download like punkt, stopwords as separate row items
Change the line ending from windows to UNIX

Changing the line ending is a very important step. Can be easily done through Sublime Text or Notepad++. In Sublime Text, it can done from the View menu, then Line Endings.
Hope this helps
Hey i'd like to install the NLTK pos_tag on my Heroku server. How can i do so. Please give me the steps as im new to the Heroku server system.