: The Eternal Edition is specifically an update for the Wrath of the Lamb DLC . It will not function with the base game alone.
Before extracting the .rar file, confirm you have the following: The-Binding-of-Isaac-Eternal-Edition.rar
: You will need a tool like WinRAR or 7-Zip to unpack the .rar archive. 2. Installation Steps : The Eternal Edition is specifically an update