Hello,
It appears you are posting within a Google Group that discusses our
App-Engine product on the
Google Cloud Platform. Due to this, I will be providing you assistance on the basis of best efforts as we do not support Google Course Builder.
My understanding of the issue you have mentioned leads me to believe that you are trying to set up Course Builder as described
here. You may find the support page for this product
here. However, as you have mentioned that your OS is Windows and that you are encountering a permission denied issue, you may try to run the script as "Run as Administrator". This will rule out your user account on your Windows as the culprit.
Also, I was able to find a support community for this, you maybe be able to get assistance by contacting the community
here. If you cannot find a posting with your issue, you can always create a new thread on the provided URL on the page shared above. Lastly, you can always contact Google for support when it comes setting this product up for your institution
here.
I hope this helps!