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

lxml
1.0.beta

This version was deleted from PyPI around 2023-12-31. Installing fails with:
$ pip3 install lxml==1.0.beta ERROR: Could not find a version that satisfies the requirement lxml==1.0.beta
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==1.0.beta
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-1.0.beta-py2.4-linux-i686.egg (168.4KB)
lxml-1.0.beta-py2.4-linux-x86_64.egg (196.0KB)
lxml-1.0.beta-py2.4-win32.egg (152.6KB)
lxml-1.0.beta.tar.gz (345.9KB)
lxml-1.0.beta.win32-py2.4.exe (211.1KB)