The legal way to get a 1.02 ISO is to "dump" or rip it from a physical retail disc that you own.
The final NTSC revision. This version fixed several glitches and is recognized as the definitive competitive version of the game. Why Version 1.02 is the Competitive Standard super smash bros melee 102 iso hot
The competitive Melee community standardized Version 1.02 for several reasons: The legal way to get a 1
You can use MD5 checksum tools to verify that your ripped file is indeed the 1.02 version required for Slippi. Setting Up the ISO for Modern Play super smash bros melee 102 iso hot
A Wii homebrew app that allows you to play your ripped ISOs on a real Wii console using native GameCube controllers.