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Ironically, nothing infuriates me more than what I did. My apologies. Actually I found the answer on a competitor site that I probably shouldn't like. Here is the text. From the copied text you should be able to find the site.

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Stickweld

update works on a DNX5190 with 2019.10 NT NA. no special .unl or .gma

Just successfully loaded into internal memory a 2019.10 north america unlocked map on a DNX5190 that had previously a 2012 map with no options from Kenwood/Garmin for a new map.

First I updated the kenwood DNX5190 with the latest available firmware from kenwood site.

I did not have any sample .unl or .gma files so just made 2 dummy files using MSword and renamed them gmapsupp.unl and gmapsupp.gma

I used a blank thumb drive and let the DNX5190 write the Garmindevice.xml info file to it. To that garmin directory I added an unlocked gmapsupp.img of 2019.10 NT North America (2.802 Gb in size), and made two dummy files using MSword called gmapsup.unl and gmapsup.gma. Once those four files are in the garmin directory, the head unit happily loaded the map from the thumb drive when I selected update on the Kenwood. After completion, i reset the head unit and it now the map info shows it has the new 2019.10 map loaded.

The DNX5190 does not have a SD card slot or rear mini USB. It only has the single USB port on a cable. I was surprised it accepted the dummy .unl and .gma files. I thought they might "brick" it. After loading the new map, the unit has just 296.5mb free space according to the garmindevice.xml file where prior to the 2019 map update it had 1.479 Gb free space.

This site was a huge help in getting this to work and I joined just to post my success and help out by adding one more model to the list of units Kenwood says can't be upgraded, but obviously can if you know how.