If you are searching for you likely know who Fitgirl is. For those who don’t: Fitgirl is a reputed (though controversial) repacker who compresses game files using advanced algorithms like FreeArc and LZMA2.
Version 1.0.2 was the original stable release, but is the definitive edition. Here is exactly what the developer patched and improved: Kio-s Adventure V1.0.3 Fitgirl Repack