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

fcn-f0-data-fcn-1953
1.0.0

This version was deleted from PyPI around 2024-06-18. Installing fails with:
$ pip3 install fcn-f0-data-fcn-1953==1.0.0 ERROR: Could not find a version that satisfies the requirement fcn-f0-data-fcn-1953==1.0.0
View other deleted versions of fcn-f0-data-fcn-1953

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/2024-06-17/ \ fcn-f0-data-fcn-1953==1.0.0
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Or, download files manually

And install manually via pip:
fcn_f0_data_fcn_1953-1.0.0-py3-none-any.whl (84.5MB)
fcn_f0_data_fcn_1953-1.0.0.tar.gz (84.5MB)