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

custatevec-cu11
1.6.0

This version was deleted from PyPI around 2024-05-10. Installing fails with:
$ pip3 install custatevec-cu11==1.6.0 ERROR: Could not find a version that satisfies the requirement custatevec-cu11==1.6.0
View other deleted versions of custatevec-cu11

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/2024-05-09/ \ custatevec-cu11==1.6.0
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Or, download files manually

And install manually via pip:
custatevec_cu11-1.6.0-py3-none-manylinux2014_aarch64.whl (36.7MB)
custatevec_cu11-1.6.0-py3-none-manylinux2014_x86_64.whl (36.7MB)