It's pretty common its because its a .jar file I think. False positives are common, esp with avast I think. You should be fine as long as you're doing it from official website. Although I haven't used epicbot in a long long time
It is because the EpicBot.exe that installs the bot also has sketchy 3rd party programs that can be installed along with it. All you have to do is click decline for all of the 3rd party programs and you're fine.