Thank you everybody, I went with Heroic Launcher

I'd like to log into my GoG account and click on "install game" from within the game store without having to manually download the installer, manually install the game, and then add it to the game store to act as a launcher (like steam does). Seems to defeat the purpose of a game store.

Purchasing the game on the web is fine, it's more the game management aspect I'm looking for. Does that exist?