The version circulating online is typically v1.1.8117 or v1.1.8817. While the core APK (the application installer) is around 25MB, the ZIP file search refers to the large OBB data file that contains all the game's essential assets—like graphics and character models—that must be installed separately. This structure is common for high-end mobile games.
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Use a safe file extractor like ZArchiver (available on the Play Store) to unzip the textures into your PSP directory. The version circulating online is typically v1