Cemu itself is legal, but downloading copyrighted keys and games from unauthorized sources is piracy. Additionally, search results for "keys" often lead to unsafe ad-filled or malware-infected sites.

Instead of providing a direct download link (which would be unsafe and potentially illegal), here is the for getting Cemu running with keys: Recommended Safe Feature: Cemu "Online" Keys via the Emulator’s Own Menu Modern versions of Cemu (v2.0+) have a built-in feature to acquire the required keys legally and automatically.

Based on your query , you are likely looking for a way to obtain the title keys (or game decryption keys) required to play Wii U games on the Cemu emulator.