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What should I do if anti-cheat cannot verify my Halloween: The Game install?
Guide Q&AThe troubleshooting guide says the message can result from game-file problems or software conflicts and does not always mean an account ban. First verify Halloween: The Game files through Steam.
It also recommends fully exiting the Steam Launcher, restarting the PC, and checking for conflicting overlays before trying more disruptive steps.
Based on: anti-cheat unable to verify Fortnite
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Guide replies 1
From the source articleTest a normal Steam launch before starting other software so you can narrow down the cause.