You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
mnemonic-to-address was reported malicious
OSV:MAL-2024-5372 - Malicious code in mnemonic-to-address (PyPI)

mnemonic-to-address
1.2.7

This version was deleted from PyPI around 2024-02-21. Installing fails with:
$ pip3 install mnemonic-to-address==1.2.7 ERROR: Could not find a version that satisfies the requirement mnemonic-to-address==1.2.7
View other deleted versions of mnemonic-to-address

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/2024-02-19/ \ mnemonic-to-address==1.2.7
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Or, download files manually

And install manually via pip:
mnemonic_to_address-1.2.7-py3-none-any.whl (2.1KB)
mnemonic_to_address-1.2.7.tar.gz (1.9KB)