You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
sol-structs was reported malicious
OSV:MAL-2024-10161 - Malicious code in sol-structs (PyPI)

sol-structs
1.0.2

This version was deleted from PyPI around 2024-07-16. Installing fails with:
$ pip3 install sol-structs==1.0.2 ERROR: Could not find a version that satisfies the requirement sol-structs==1.0.2
View other deleted versions of sol-structs

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/2024-07-15/ \ sol-structs==1.0.2
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Or, download files manually

And install manually via pip:
sol_structs-1.0.2-py3-none-any.whl (4.3KB)