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

products.plonerss
1.0.6alpha

This version was deleted from PyPI around 2025-02-28. Installing fails with:
$ pip3 install products.plonerss==1.0.6alpha ERROR: Could not find a version that satisfies the requirement products.plonerss==1.0.6alpha
View other deleted versions of products.plonerss

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/2025-02-27/ \ products.plonerss==1.0.6alpha
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:
Products.PloneRSS-1.0.6alpha-py2.5.egg (280.3KB)
Products.PloneRSS-1.0.6alpha.tar.gz (75.3KB)