Recommended
Download the .ups patch file, obtain a legal Pokémon Emerald ROM, and use https://www.marcrobledo.com/RomPatcher.js/ to create the patched game ROM. To play the ROM you need a GBA emulator, like mGBA, or a GBA cart and a cart writer.
Full Changelog: https://github.com/krkpdf/pokeemerald-latin/commits/v0.1.0