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A: Generally, yes. A "verified" client means hash-matched to Blizzard’s original data. A "clean" client implies no server-specific patches have been applied. Many users download a verified client, then patch it manually for their chosen server. wow legion 73 5 client verified download
A: No. The Pre-Legion event (Demon Invasions) was patch 7.0.3. Patch 7.3.5 includes Argus, the final raid (Antorus), and the post-Legion Silithus scenario. Disclaimer: This article is for educational and archival
Note: I am not endorsing any specific server, only explaining the technical method. the final raid (Antorus)