I have Fedora 28 WS with Firefox and Download Helper for videos. There has been a change in Download Helper and now clicking to download brings a popup with additional items necessary to allow dl.

There are several items(coapps?) including those for windows and apple
The one I chose is net.downloadhelper.coapp-1.1.3-1_amd64

Clicking on the popup brought it to my dl file.

I assume command line is the simplest way to install the coapp but I'm not familiar with command wording or where it should go.

Any help gratefully accepted