You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
perfviewer was reported malicious
OSV:MAL-2025-191814 - Malicious code in perfviewer (PyPI)

perfviewer

This package was deleted from PyPI around 2025-11-25. Installing fails with:
$ pip3 install perfviewer ERROR: Could not find a version that satisfies the requirement perfviewer (from versions: none) ERROR: No matching distribution found for perfviewer

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/2025-11-24/ \ perfviewer
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Or, download files manually

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14.2.1
14.2.2
14.2.3
14.2.4
14.2.5