It seems that this is a real issue. In How to Install GitKraken, they point to a %APPDATA%/.gitkraken
folder. Once there, you have "profiles" and "service" folders and "config", "log" and "secFile" files. Inside those folders, there are no signs of an executable. It's not under Program Files, nor in the PATH environment variable, it's nowhere to be found. If you install it again, it opens normally and logged in your profile, but after closing it, there's no way to open it again. There are no shortcuts.
What am I missing?
By default GitKraken is installed to your local app data folder. You can find the executable file inside %LOCALAPPDATA%\gitkraken\app-<app-version>
As of this writing, the latest version is 2.0.1 so the exe will be %LOCALAPPDATA%\gitkraken\app-2.0.1\gitkraken.exe
And easier way to open the software would be using the shortcut in the start menu: