What about mac os Catalina 10.15.3 update? It doesn't work as of now. Last few updates don't work on mac
Well, you might need to work the app, ever since the macOS update to Catalina it went 64 bits, so try this
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, second once bat is open choose the spellbook app, then make sure privilege and unlock are checked, apply, once that done close Batcmod, right-click on the app, first, you will get delete or cancel do cancel, then a second time a new dialogue box choose open, and sometimes it takes a third time right-click one last time, and open should work fine.