: Once the files are on your machine, you can play without an internet connection by simply opening the local HTML file.
: Note that worlds created in this version are typically saved to your browser's local storage or within the extracted folder as .epk files. Eaglercraft Desktop Runtime for 1.5.2 - GitHub
Unlike the official Minecraft client that pulls sounds from system files, Eaglercraft embeds compressed OGG audio files for footsteps, door creaks, and creeper hisses. The ZIP also includes legacy texture packs (e.g., “Faithful 32x” or “Default Retro”) pre-configured for version 1.5.2.