Showing "Custom Menu" widget instead..

I have downloaded jQuery Accordion Menu and replaced a Custom Menu with it in one of my sidebars. When i go to the page, it still appears as the Custom Menu, no accordion. Instead, it still has drop downs and is in the old style. (Like it is still a Custom Menu instead?) Having the accordion widget there hasn’t changed anything. I really need it and this is getting frustrating.

At first, I thought it might have something to do with allowing jQuery libraries? Tried that didn’t work. There’s a conflict somewhere. I can’t find it. Any help?

https://www.ads-software.com/plugins/jquery-vertical-accordion-menu/