I figured it out. It was a permissions issue that I solved by running:
sudo chmod 777 /home/user/.cache/pip
and
sudo chmod 777 /home/user/.cache/pip/*
I'm not sure why this was causing the issue, especially since I also tried downloading pyindi-client from pypi.org/project/pyindi-client/#description and was also causing the same issue. Again, probably something really stupid, but I guess atleast it's working now.

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