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

fiftyone-desktop
0.19.3

This version was deleted from PyPI around 2023-10-21. Installing fails with:
$ pip3 install fiftyone-desktop==0.19.3 ERROR: Could not find a version that satisfies the requirement fiftyone-desktop==0.19.3
View other deleted versions of fiftyone-desktop

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/2023-10-20/ \ fiftyone-desktop==0.19.3
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:
fiftyone_desktop-0.19.3-py3-none-macosx_10_10_x86_64.whl (75.5MB)
fiftyone_desktop-0.19.3-py3-none-macosx_11_10_arm64.whl (79.2MB)
fiftyone_desktop-0.19.3-py3-none-manylinux1_x86_64.whl (75.9MB)
fiftyone_desktop-0.19.3-py3-none-manylinux2014_aarch64.whl (81.4MB)
fiftyone_desktop-0.19.3-py3-none-win_amd64.whl (51.5MB)