Maybe you don't need to disable but to exclude: The trainer exe and the tmp file in this location -> C:\Users\YourWindowsUserName\Cheathappens\Work\ like this ~CheathappensTrainer* (wildcard file exclusion). If your AV does not support file exclusion go for the -Work- folder.
Downloaded the game from Steam and our latest trainer on Windows 10 x64 v1703 (Creators Update) with Defender + SmartScreen + Firewall enabled and only the trainer excluded, ran the trainer with admin rights, activated it and used the options according to the instructions provided.
Have the trainer activated the way the instructions say. When you have confirmation that the trainer is working press Numpad 4 once, listen for 'Activated', shoot some arrows with the Repeater and press Numpad 4 again and get 'Activated' again. You now have unltd. arrows and no need to reload anymore.
You might need to repeat this once you get to another part of the game (aka next level).
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firewall and other security software.
on trainer and game.
version and distribution.