Easy?

How do you know that the error wasn’t yours? Why didn’t you try to contact the plugin’s author about this by posting a topic in the plugin’s dedicated sub-forum?

Try reviewing:
https://pippinsplugins.com/how-to-leave-a-good-bad-review/
https://chrislema.com/theres-wrong-way-give-plugin-feedback-wordpress-org/

When I read something is easy I expect it to be easy to use and this certainly is not. Read the installation page and does not even tell you to cut and paste from the test area into your page – how difficult is it to add that simple instruction?

I know I would get many support requests from my clients trying to format the style of the table as well.