Hi @fernweh_vibe, and welcome to the Streamlit community! 
May I ask which method(s) have you tried?
It should work if you do a pip install (see here for details → NLTK :: Installing NLTK), then import nltk and your corpus in your streamlit_app.py file, as follows:
import nltk
nltk.download("popular")
Let me know if that sorts your issue 
Best,
Charly
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