The "selective" tag in setup-fitgirl-selective-english.bin refers to a specific feature of FitGirl Repacks that allows users to save data. Most modern games include audio and cinematic files for dozens of languages (English, French, German, Spanish, etc.), which can add several gigabytes to the total download size.
The installer will usually throw an "MD5 mismatch" or "file not found" error. You must download it from the original source and place it in the installation directory. setup-fitgirl-selective-english.bin