You need an (e.g., Configurator 2.5 for macOS 10.13) that is no longer signed or distributed by Apple, and you have no access to the App Store history.
Use a macOS device that already has Apple Configurator 2 installed apple configurator 2 download without app store
If your Mac cannot run the latest version and the App Store won't let you download it, you can "force" an older version if you have previously "purchased" it (even though it's free) on another Mac: You need an (e