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

CTFscan
0.3

This version was deleted from PyPI around 2023-11-05. Installing fails with:
$ pip3 install CTFscan==0.3 ERROR: Could not find a version that satisfies the requirement CTFscan==0.3
View other deleted versions of CTFscan

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/2023-11-04/ \ CTFscan==0.3
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
CTFscan-0.3-py3-none-any.whl (6.8KB)
CTFscan-0.3.tar.gz (2.4KB)