You are never supposed to find any download in any purchase receipt of any shop. Our products are all available in Trial version so, you are normally supposed to download and install them first, then purchase them.
There's only one place to download the installer, and it's the Products page of the GSX page of this site.
If you see the pilots and crew boarding, the only possible reason why you don't see passengers is you have 0 passengers. Maybe there's a problem with the payload, but you can override the number of passengers by un-checking the "Estimate Passenger Number" option in the GSX Settings, so you can manually set the correct amount.