Another way to do this is to go to Path > Break apart. Then delete one or the other object.
Or manually delete one stroke with the node tool .

On the Mac, you double click on the font and when the window pops up you click on Install Font.
The font must be installed in the Computer folder, though to be accessible to Inkscape. I've found that if it's installed in the user folder it won't be in the Inkscape list.