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

ctranslate2
4.2.0

This version was deleted from PyPI around 2024-04-12. Installing fails with:
$ pip3 install ctranslate2==4.2.0 ERROR: Could not find a version that satisfies the requirement ctranslate2==4.2.0
View other deleted versions of ctranslate2

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/2024-04-11/ \ ctranslate2==4.2.0
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Or, download files manually

And install manually via pip:
ctranslate2-4.2.0-cp310-cp310-macosx_10_9_x86_64.whl (14.0MB)
ctranslate2-4.2.0-cp310-cp310-macosx_11_0_arm64.whl (1.2MB)
ctranslate2-4.2.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl (14.9MB)