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

backend.ai-kernel-binary
25.6.0rc3

This version was deleted from PyPI around 2026-05-18. Installing fails with:
$ pip3 install backend.ai-kernel-binary==25.6.0rc3 ERROR: Could not find a version that satisfies the requirement backend.ai-kernel-binary==25.6.0rc3
View other deleted versions of backend.ai-kernel-binary

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/2026-05-17/ \ backend.ai-kernel-binary==25.6.0rc3
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Or, download files manually

And install manually via pip:
backend_ai_kernel_binary-25.6.0rc3.tar.gz (7.2MB)
backend.ai_kernel_binary-25.6.0rc3-py3-none-manylinux2014_aarch64.macosx_11_0_arm64.whl (7.2MB)
backend.ai_kernel_binary-25.6.0rc3-py3-none-manylinux2014_x86_64.macosx_11_0_x86_64.whl (15.2MB)