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

upgini
1.1.251

This version was deleted from PyPI around 2024-02-16. Installing fails with:
$ pip3 install upgini==1.1.251 ERROR: Could not find a version that satisfies the requirement upgini==1.1.251
View other deleted versions of upgini

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/2024-02-15/ \ upgini==1.1.251
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Or, download files manually

And install manually via pip:
upgini-1.1.251-py3-none-any.whl (162.4KB)
upgini-1.1.251.tar.gz (200.6KB)