blockchain – bitcoin-etl: problems with installing

I am trying to install bitcoin-etl: https://github.com/blockchain-etl/bitcoin-etl to analyze bitcoin blockchain.

I have Mac OS and python3, I run this in terminal:

pip install bitcoin-etl

Also tried this:

python3 -m pip install bitcoin-etl

The output is:
ERROR: Could not find a version that satisfies the requirement bitcoin-etl

ERROR: No matching distribution found for bitcoin-etl


I have python3 and pip installed:
python3 -m pip --version
pip 21.0.1 from /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pip (python 3.8)

Any suggestions?
Thanks!!!

P.S. BTW, if you know any other ways to analyze bitcoin blockchain (I need csv for block counts vs time) your advice would also be very appreciable!