Hi,
We build the doc on linux machines all the time I’m afraid. It might be possible that it is not working on Windows 
Do you have a linux machine you can use to get the doc by any chance?
Another convoluted way to do this is to download it directly from our build.
On every PR (pick one randomly on pytorch github), there is a pytorch_python_doc_build that actually builds the doc. You can check there the artifact page that contains the full doc: https://app.circleci.com/pipelines/github/pytorch/pytorch/326575/workflows/30cd30c4-fea5-4165-ab08-a54b85d0e67e/jobs/13676034/artifacts 16
You can download all of these as a single file by using circle CI API directly: Storing Build Artifacts - CircleCI 8