Riot Games announced that it would implement Vanguard anti-cheat software in League of Legends (LoL) in late February or early March 2024. It eventually did so in LoL’s Patch 14.9, which Riot released on May 1. However, this change has caused some players to get the VAN9001 error and prevented them from playing the game.
The development team knew the new software implementation would be a big issue with its player base, so they wrote an in-depth explanation of anti-cheat, Vanguard, and LoL about three weeks ago on the League of Legends blog. Nevertheless, many were still caught by surprise, especially those who bypassed the TPM 2.0 requirements when upgrading to Windows 11.
