The internet archive and the Redump project curate public domain preservation copies. Search for "Redump GameCube Super Smash Bros Melee (USA) (En,Fr,Es) (v1.02)." This is the safest public path to a clean ISO.
In 2026, original GameCube discs are aging. Laser rot, scratched media, and the rising cost of physical copies ($80-$120 for a loose v1.02 disc) have pushed the community toward digital backups. This is where the "iso download" comes in.
An ISO is a digital archive of the GameCube disc. The NTSC 1.02 ISO is approximately 1.35 GB (though often compressed to 500MB-700MB in formats like RVZ or NKit).
Downloading the ISO is step one. To make it the "top" experience, you need the modern ecosystem.