Don’t forget, there are two sets of environmental_data.xml. Only one of them is used, either media1/play/web_service/environment_data.xml or play/web_service/environment_data.xml. Find out which one it uses, then edit it to load from the correct path.
I don’t understand what you are trying to do though, are you trying to load the expressInstall.png image so that you can enable flash or just to load it there for the websites design. If you’re trying to enable flash, you don’t need the expressInstall.png image loaded, it’s not necessary. All you have to do is enable flash in your browser.
Google Chrome: https://helpx.adobe.com/flash-player/kb/enabling-flash-player-chrome.html
Mozilla Firefox: https://helpx.adobe.com/flash-player/kb/enabling-flash-player-firefox.html
Microsoft Edge: https://helpx.adobe.com/flash-player/kb/flash-player-issues-windows-10-edge.html
Internet Explorer: https://helpx.adobe.com/flash-player/kb/install-flash-player-windows.html
I also doubt that it’s being loaded from sites/default/files/js/js_jpJjaUC0z8JMIyav5oQrYykDRUb64rpaUDpB4Y9aklU.js as that file has no occurrences of media1.clubpenguin.com. It’s being loaded either from environmental_data.xml (one that you haven’t configured) or another SWF file perhaps? I’ve never really noticed the image when setting it up.