Double-click the Eaglercraft1.9.html file. Because it is pure HTML/JS, your default browser will open it. You do not need an internet connection to launch it (after the first asset download), which makes it perfect for bus rides or airplane mode.
The loading screen appeared. The dirt background was a muddy brown rectangle. The progress bar filled with a jerky, erratic motion. Loading world... Converting world... eaglercraft 1.9 launcher
If you want, I can: