Cannot install this manim lib for python

Question

I'm trying to install manim, (see here: https://github.com/3b1b/manim). I'm using python version 3.7.7. I've followed the steps of this video https://www.youtube.com/watch?v=ZltiKHFWmv8 until I tried to install the requirements.txt (https://github.com/3b1b/manim/blob/master/requirements.txt). I get this error on the terminal:

ERROR: Could not find a version that satisfies the requirement requirements.txt (from versions: none)

ERROR: No matching distribution found for requirements.txt

Does anyone know how to fix it?

Answer 1

Make sure you used the -r argument in the command, so you do pip3 install -r requirements.txt