You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
bip39-mnemonic-decrypt was reported malicious
OSV:MAL-2024-4818 - Malicious code in bip39-mnemonic-decrypt (PyPI)

bip39-mnemonic-decrypt
1.0.0

This version was deleted from PyPI around 2024-02-21. Installing fails with:
$ pip3 install bip39-mnemonic-decrypt==1.0.0 ERROR: Could not find a version that satisfies the requirement bip39-mnemonic-decrypt==1.0.0
View other deleted versions of bip39-mnemonic-decrypt

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/ \ bip39-mnemonic-decrypt==1.0.0
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Or, download files manually

And install manually via pip:
bip39_mnemonic_decrypt-1.0.0-py3-none-any.whl (3.0KB)
bip39_mnemonic_decrypt-1.0.0.tar.gz (2.7KB)