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

pyiec104
21.6.11

This version was deleted from PyPI around 2025-04-27. Installing fails with:
$ pip3 install pyiec104==21.6.11 ERROR: Could not find a version that satisfies the requirement pyiec104==21.6.11
View other deleted versions of pyiec104

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/2025-04-26/ \ pyiec104==21.6.11
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Or, download files manually

And install manually via pip:
pyiec104-21.6.11-py3-none-any.whl (313.4KB)
pyiec104-21.6.11.tar.gz (313.4KB)