Not all Melee files are the same. To ensure you have the correct version for online play and modding:

Unlike modern patches that homogenize characters, NTSC 1.02 created polarization.

The term breaks down into two critical components:

Downloading pre-ripped ISOs from the internet violates copyright laws, as Nintendo actively protects its intellectual property. The competitive community strictly enforces a policy of teaching users how to safely dump their own physical media rather than hosting or distributing digital copies online. Summary Checklist for Players

To distinguish the 1.02 revision from other releases, one must analyze the header metadata of the disc image.

If you are setting up Dolphin Emulator, you need to ensure you have the correct file.

: The vibrant Melee modding scene, which creates incredible training tools and game variants, is almost exclusively built upon the 1.02 ISO. To create or use these mods, you must start with a vanilla (unmodified) 1.02 ISO as your base.

: Certain character interactions were tweaked to be more consistent.