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

voicevox-python
2023.8.30.21.16

This version was deleted from PyPI around 2025-04-15. Installing fails with:
$ pip3 install voicevox-python==2023.8.30.21.16 ERROR: Could not find a version that satisfies the requirement voicevox-python==2023.8.30.21.16
View other deleted versions of voicevox-python

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/2025-04-14/ \ voicevox-python==2023.8.30.21.16
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:
voicevox_python-2023.8.30.21.16-py3-none-any.whl (8.1KB)
voicevox_python-2023.8.30.21.16.tar.gz (8.1KB)