Games protected by Tencent's Anti-Cheat Expert are refused
Arknights: Endfield ships Anti-Cheat Expert (ACE), Tencent's kernel-mode anti-cheat, as an AntiCheatExpert folder beside the exe. The anti-cheat check knew Easy Anti-Cheat, BattlEye, GameGuard and EA Javelin, but not ACE. So the OptiScaler engine was installed, and the game crashed as soon as it started (#113). Loading DLLs into a process ACE protects is exactly what it looks for: a crash at best, an account ban at worst.
A game with an AntiCheatExpert folder is now refused like the others. The same override (the checkbox under the warning, --ignore-anticheat) still exists for an offline game, at your own risk.
If DLSS 5 is already installed in such a game, open it in the app and press Remove.
README: the anti-cheat list is complete, and a new entry explains the horizontal lines you get with frame generation when V-Sync is off (#112).
Everything from v0.13.26 is included.