I'm sorry to hear about that! Let us see if we can't resolve that!
I wanted to see if I could recreate this situation, so I uninstalled, deleted, and re-downloaded the file and followed the installation and was able to start it up just fine. It may be that the .exe you are trying to start up is not the installed game, but the installer itself.
When you first installed the game, there should be a window that comes up after the agreements, and you hit agree, and then it gives you an option to place the game file somewhere on your computer (the "Directory"). That file, wherever you place it, should be the actual game. So you might want to retry downloading it and placing it inside of a folder that you can find, or you can put it on your desktop.
If this doesn't fix the issue, let me know and I will do my best to help you further.