If the download link gives you an .exe , .apk (unless downloading the emulator itself), or .bat file, do not run it . PSP games will only ever be .iso , .cso , .rar , or .7z .
Many "highly compressed" ISOs found online are actually fan-ports or modifications of this engine. Focuses on mission-based titan slaying. Compression: Shrank from ~600MB down to as little as 2. The Lost Visual Novel: "Wings of Freedom" Shingeki no Kyojin: Humanity's Last Hope Japanese-only visual novel with minor action elements. attack on titan psp highly compressed