python – Installation of backtesting package through Conda failed

I’m using backtesting.py package kernc.github.io/backtesting.py/ in the latest Anaconda distribution. The computation is finished successfully with right result. But it’s not possible to show the plot since the Bokeh version for the Backtesting package is not compatible with the python version. I don’t know how to fix the problem. Then I tried to use Conda and install python 3.8, numpy, matplotlib and bokeh one by one. But it gives the following error message when I install backtesting with the command conda install backtesting=0.6.4

Channels:
 - conda-forge
 - defaults
Platform: win-64
Collecting package metadata (repodata.json): done
Solving environment: failed

PackagesNotFoundError: The following packages are not available from current channels:

  - backtesting

Current channels:

  - https://conda.anaconda.org/conda-forge
  - defaults

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

Is there any way to fix it? Or is it possible to fix the problem in Anaconda so that it can show the plot?