I am trying to use tensorflow but my python is to recent. I have python3.7.2 and I need py3.6 in order to install and use tensorflow. 

I have installed py3.6.8 but I still can't install it with pip. Is there a way of interchanging between versions of python to install/use tensorflow. Or is it to do with my pip version?

The error is:
Could not find version that satisfies the requirement tensorflow in versions: 

The main problem is that I don't know how to get tensorflow. Can someone help me do this?