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

tremolo
0.0.503

This version was deleted from PyPI around 2024-04-11. Installing fails with:
$ pip3 install tremolo==0.0.503 ERROR: Could not find a version that satisfies the requirement tremolo==0.0.503
View other deleted versions of tremolo

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/2024-04-10/ \ tremolo==0.0.503
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Or, download files manually

And install manually via pip:
tremolo-0.0.503-py3-none-any.whl (40.1KB)
tremolo-0.0.503.tar.gz (33.7KB)