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

flatland-rl-optimised-code
3.0.16

This version was deleted from PyPI around 2023-11-01. Installing fails with:
$ pip3 install flatland-rl-optimised-code==3.0.16 ERROR: Could not find a version that satisfies the requirement flatland-rl-optimised-code==3.0.16
View other deleted versions of flatland-rl-optimised-code

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/2023-10-31/ \ flatland-rl-optimised-code==3.0.16
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Or, download files manually

And install manually via pip:
flatland_rl_optimised_code-3.0.16-py2.py3-none-any.whl (1.8MB)