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

regula.documentreader.webclient
6.9.1rc0

This version was deleted from PyPI around 2023-10-07. Installing fails with:
$ pip3 install regula.documentreader.webclient==6.9.1rc0 ERROR: Could not find a version that satisfies the requirement regula.documentreader.webclient==6.9.1rc0
View other deleted versions of regula.documentreader.webclient

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/2023-10-06/ \ regula.documentreader.webclient==6.9.1rc0
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Or, download files manually

And install manually via pip:
regula.documentreader.webclient-6.9.1rc0-py3-none-any.whl (265.5KB)
regula.documentreader.webclient-6.9.1rc0.tar.gz (114.6KB)