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

lxml
2.1beta3

This version was deleted from PyPI around 2023-12-31. Installing fails with:
$ pip3 install lxml==2.1beta3 ERROR: Could not find a version that satisfies the requirement lxml==2.1beta3
View other deleted versions of lxml

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/2023-12-29/ \ lxml==2.1beta3
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:
lxml-2.1beta3-py2.4-win32.egg (2.3MB)
lxml-2.1beta3-py2.5-win32.egg (2.3MB)
lxml-2.1beta3.tar.gz (2.4MB)
lxml-2.1beta3.win32-py2.4.exe (2.3MB)
lxml-2.1beta3.win32-py2.5.exe (2.3MB)