ACE not working

Correct, make sure that you have not accidentally placed it in your Arma addons folder. You must place it directly into the Arma3 directory. Also some servers may be running an out of date ACE which will give you an error. Also check to see if you are running CBA
 
Can you define what you mean when you say it doesn't work? Does it not show up in the launcher? Does it crash your Arma? Does it not work in a server?
 
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