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

nextpy
0.2.51

This version was deleted from PyPI around 2023-12-25. Installing fails with:
$ pip3 install nextpy==0.2.51 ERROR: Could not find a version that satisfies the requirement nextpy==0.2.51
View other deleted versions of nextpy

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/2023-12-24/ \ nextpy==0.2.51
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Or, download files manually

And install manually via pip:
nextpy-0.2.51-py3-none-any.whl (531.9KB)
nextpy-0.2.51.tar.gz (642.0KB)