The game needs local storage access to save your worlds. If you "preview" it inside Google Drive, the browser sandbox restricts local storage. Downloading it releases those restrictions.
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: Offers the latest "stable and widely deployed" 1.8.8 offline client as a ZIP or HTML file. Eaglercraft Dev The game needs local storage access to save your worlds
: Depending on your preferences, you might want to tweak the game settings for performance or gameplay. eaglercraft 18 download google drive work