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

nlsq
0.1.5

This version was deleted from PyPI around 2025-11-01. Installing fails with:
$ pip3 install nlsq==0.1.5 ERROR: Could not find a version that satisfies the requirement nlsq==0.1.5
View other deleted versions of nlsq

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/2025-10-31/ \ nlsq==0.1.5
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Or, download files manually

And install manually via pip:
nlsq-0.1.5-py3-none-any.whl (212.3KB)
nlsq-0.1.5.tar.gz (597.8KB)