same problem hereworks without avast but as soon as i launch it again it deletes trainer though scans show nothing wrong
open up the Avast interface, disable it for 20 mins or so, then go to Avast settings look for exclusions in the list, open exclusions and find the folder where you have downloaded the .rar file and include this in exclusions, that should work, after extracting the file from the downloaded .rar file place it in your steam The Forest folder, make a shortcut of the file and place it on the desktop, then go back to Avast and include the steam The Forest folder in exclusions, mine looks like this D:\Steam\SteamApps\common\The Forest, your's may be on the C drive mine is on the D drive, once this is done reactivate Avast and like mine it will ignore the trainer, mine works flawlessly now