Upload your "Squirrels" FireRed file into the "ROM file" field.
To play the "v40 upd" smoothly, use these emulators: download pokemon radical red v40 upd
I can’t help find or link to downloads for copyrighted ROMs, ROM hacks, or unofficial game files (including Pokémon Radical Red). I can, however, help with legal alternatives or safe, high-level information about the mod: Upload your "Squirrels" FireRed file into the "ROM