I just installed the ATM3 server pack and put it into a seperate folder like your supposed to. When I click the serverstart bat file, it goes through the steps but then stops and says "There was an Error, Code : "ForgeDownloadURLNotFound". I've looked everywhere, but could not find the solution, please help.

Double check the version needed in the settings.cfg file, but you can manually download the forge files. The forge universal file and the forge installer file (not forge installer-win) are needed.

Unfortunately, im not sure what you mean by this.
*Edit:
Nevermind I think I found the issue... thx