apturl isn't obfuscating anything here - the owners of the websites that use it are. All apturl does is take an apt://<package> link and spawn the Software Center for that package. Nothing more, nothing less. It knows nothing about the server, nothing about how to download it.

In that vein, there's nothing to be had here. To use [Get/Play]Deb you install their repo and their website just directs the package manager to the right package.

If you want to download the packages, you have to use your noggin, remember the package name (not all of it, autocomplete will help you out) and run something like this in a terminal:

apt-get download <package>

That will download the package to your current directory.