Why? the plugin is broken now because it’s using an older version of ACF (5). If you install 6 it breaks and no longer works correctly. Also there are multiple threads (including my own) that talk about there being no response. Even the premium pro version does not get any response or support anymore.
For anyone reading this. Because I cant update a reply I’ll have to add another one. Schema just recently got an update. It fixed everything that was wrong with it, some js that was executed for fields that were empty, and causing errors, but mainly the absence of the newest ACF 6 plugin. This also has been added in the new version.
Although I don’t like updates that took almost a year. I have to say I’m really happy the update came through. I hope the owner is well and will continue to support the free and paid pro versions more regularly.