Here is a generic guide applicable to most Legion 7.3.5 repacks found online.

Edit the client's WTF/Config.wtf (create if missing):

Offers a pre-configured 7.3.5 client (43–48 GB) designed for their servers but compatible with many repacks.

Warning: downloading, distributing, or using repacked game clients can violate Blizzard’s Terms of Service and may expose you to malware, account bans, or legal risks. This article explains what a 7.3.5 repack is, why people use them, the risks, and safe alternatives.

Why go through all this effort for an expansion that ended years ago?

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