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

virtool-core
2.26.3

This version was deleted from PyPI around 2025-08-29. Installing fails with:
$ pip3 install virtool-core==2.26.3 ERROR: Could not find a version that satisfies the requirement virtool-core==2.26.3
View other deleted versions of virtool-core

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/2025-08-28/ \ virtool-core==2.26.3
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:
virtool_core-2.26.3-py3-none-any.whl (27.9KB)
virtool-core-2.26.3.tar.gz (18.4KB)