This is an installation of the Easy Accordion block by sebastienj. This block in available in the marketplace and costs $20 USD. Please see the video tab for installation instructions.
Try installing the block without a layout on the page will get you this terse dialog.
I've created a layout with 1 column and 4 rows.
I'd like to be able to close all open tabs by clicking on the open header but this is not a deal breaker. This block functions well, installs easily. I'll test the styling ability of this block shortly.