U.S. International keyboard - Leap 15.5 KDE

I have long used the U.S. International keyboard layout as described in this article: https://en.wikipedia.org/wiki/QWERTY#US-International However, I can't seem to find it in 15.5, even though there are 4 different U.S. International layouts I've tried so far.  Any idea where I can find it? tnx jk