Suggestion: Learn how to utilize conda by perusing get started with conda. The difficult you experience is an extremely regular case that could be tackled by conda, as a environment manager.
Utilize an environment with Python 3.6 installed, and actuate this environment each an ideal opportunity to work with your task.
# create an environment with python 3.6
conda create -n py36 python=3.6
# activate this environment
conda activate py36
You can also try the below code, By overriding the python 3.7 within the base with python 3.6
conda install -n base python=3.6
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