4.3 4 Download ((exclusive)) — Wow Cataclysm Client

This is a grey area. The is copyrighted by Blizzard Entertainment. However, you are allowed to download the client if you own a legitimate license for Cataclysm (e.g., from the original 2011 release). Practically speaking, Blizzard rarely pursues individuals downloading old, unsupported clients. They focus on server operators who monetize private realms.