You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

volttron
10.0.4rc1

This version was deleted from PyPI around 2023-09-30. Installing fails with:
$ pip3 install volttron==10.0.4rc1 ERROR: Could not find a version that satisfies the requirement volttron==10.0.4rc1
View other deleted versions of volttron

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-09-29/ \ volttron==10.0.4rc1
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
volttron-10.0.4rc1-py3-none-any.whl (291.2KB)
volttron-10.0.4rc1.tar.gz (212.8KB)