My car is a 2016, which has the touch-screen. I was assuming all along that they just pasted the new screen on the old system, but I'm beginning to deduce now that it must have been a bigger change than that. The update kit I got says specifically it's only for 2016-2018 models. (Funny that Kia failed to notice they didn't market a 2018!)
When I took to comparing pictures of the two years, I noticed something I hadn't seen before--there is not a place to put a chip in the front of the unit on the 2015--the best pix I could cobble together attached.
Mousing around the map update site, I found that ordering for the two years is quite different.
The 2015 page instructs you to use a USB stick:
While the 2016 one says to use an SD card--which is what I should have called my update instead of a chip:
(BTW, mdude, although CarMax got it for me, I'm sure they just ordered here--what I see on the page is what I got.)
So we may be talking different languages here, folks. All I can say is, if you have the SD slot and you put in the version 12 card, you'll have signs. Lots of signs!
As regards the USB update kind, I don't know.
Sorry if I misled anybody.
(Later--wait, I found a pic that shows the SD slot much better--attached.)