The plug-in I just bought doesn't work

I'm using version 5.7.2 of 'mythicmobs'. I just downloaded 'mythiccrutable' and put it in my server. But 'mythiccrutable' doesn't work. And the free version of 'ModelEngine' 4.0.7 I tried to experience doesn't work either. My server is a 1.20.4 paper server.[Legacy attachment omitted]