Before using the steps below, you might want to check the issue jax-ml/jax#5795. I think if this has closed then pip install jaxlib should work on windows

This workaround is based on cloudhan/jax-windows-builder

Pre Install NOTE If you have a prior installation of jax remove it.

• Check if jax is installed using pip show jax
• Uninstall using pip uninstall jax

Steps for Installation

• Download a wheel for jaxlib from https://whls.blob.core.windows.net/unstable/index.html chooose, the version of wheel is based on your verison of cuda. If you dont have cuda choose cpu wheels.
• Install using pip install <jaxlib_whl> run a powershell/cmd in the folder where the wheel file is. Copy the file to a different location if you plan to install it for a specific environment.I think that the bold value in jaxlib-0.3.2-cp37-none-win_amd64.whl represents the version of python so check the version you are using in your virtualenv. Then install as pip install jaxlib-0.3.2-cp37-none-win_amd64.whl
• After that is done install jax as pip install jax