So, GameStop bought the Impulse platform (at least) from StarDock.
The new client seems based on the same engine, but it's now labelled "GameStop PC Downloads" and "powered by Impulse" in tiny print. Oh, and the app's URL is still impulsedriven.com.
I'll try to test the newest version, but I suspect this entry can remain and simply be updated (as opposed to creating a new entry for GS PC Downloads).