File Name- Eaglercraft-launcher-1.5.2.zip 'link' -

: 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

Because it was an older version, porting 1.5.2 was more feasible than porting modern Minecraft due to the smaller file size and less complex rendering engine compared to modern versions. File Name- Eaglercraft-Launcher-1.5.2.zip