If you want the path of least resistance, stop searching for a "unlock all characters yuzu repack" download and simply get this specific repack version:
"Super Smash Bros. Ultimate – Complete Collection (v13.0.1 + All DLC + 100% Unlock Save Pre-Installed)" super smash bros ultimate unlock all characters yuzu repack
Many repack groups (FitGirl, SuYu, NXBrew) offer a pre-unlocked version. Look for the phrase "Save included" or "Platinum save" in the torrent description. If you want the path of least resistance,
Installation steps for a Pre-Unlocked Repack: "Super Smash Bros
To run this title effectively via emulation, the following hardware is suggested:
Fix: Sora was the final DLC (v13.0.0). You need update v13.0.2. Find a separate DLC pack for “Fighters Pass Vol. 2 – Challenger Pack 11”.