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

CTFscan
1.3.4

This version was deleted from PyPI around 2023-11-05. Installing fails with:
$ pip3 install CTFscan==1.3.4 ERROR: Could not find a version that satisfies the requirement CTFscan==1.3.4
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==1.3.4
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-1.3.4-py3-none-any.whl (7.1KB)
CTFscan-1.3.4.tar.gz (6.8KB)