OK....You also have to delete some preference files located in "Users\Library\Preferences" and in "Library\Application Support\Sencha, Inc." You then have to re-register the application, and then bypass the "New Version Available..." dialog. Then, the above DMG file works.
As stated above, you need to delete the AppData/Application Support folder. We always will load the most current .ion that you have downloaded to this folder.
I tried the CarListings App and it does not show the Panel.
This app fails at the same place. Nothing shows in Chrome!
Something must be wrong with your general setup. Are you running a webserver? Did you point your project folder directory there? What operating system/version are you using? Did you make it to the first step?