Searching for a World of Warcraft: Legion (Patch 7.3.5) client download usually implies looking for a way to play on "private servers," as the official retail game has moved far beyond this expansion. The "Legion 7.3.5" Experience Patch 7.3.5, known as Shadow of Argus
For private servers, you must modify the realmlist.wtf file to point to the server's IP (e.g., set realmlist 127.0.0.1 for local play) Software Wow Legion 7.3 5 Client Download
Cache, Interface, and WTF folders, then re-extract the client.