Because Blizzard removed the 7.3.5 files from their CDNs (Content Delivery Networks), you cannot download this from Blizzard directly. You must rely on community archives.
Before diving into the download, it is important to understand why you want version 7.3.5 and not 7.0 or 7.2. wow legion 735 client download free
Before we discuss the download, let's be realistic. You cannot legally download the Legion 7.3.5 client for free from Blizzard anymore. Blizzard does not offer a "Classic" version for Legion. Because Blizzard removed the 7
To get the client for free, you must venture into the world of data archiving and private servers. wow legion 735 client download free
The most reliable way to download the full 50-70 GB client is via BitTorrent. Look for magnet links labeled WoW_Legion_7.3.5_26365 or WoW_Legion_7.3.5_26972.