It is defaulted to OFF with Aristois because people kept installing Seedcracker and then complaining about "boxes" showing up everywhere. You can enable it with /seedcracker render outlines XRAY (/seed on ≤1.19.2)
Make sure that you run the installer with Java only, if you do not have Java you must download it. If you opened it with Java and nothing happened (or a black box appeared for a second) you can follow this method with command prompt: