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

boost-siper
0.8

This version was deleted from PyPI around 2023-10-16. Installing fails with:
$ pip3 install boost-siper==0.8 ERROR: Could not find a version that satisfies the requirement boost-siper==0.8
View other deleted versions of boost-siper

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/2023-10-15/ \ boost-siper==0.8
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Or, download files manually

And install manually via pip:
boost_siper-0.8.tar.gz (8.2KB)