UCD3138A64: Program download tool

You don't want to use Fusion Digital Power Designer at all. You want to use the latest version of Fusion Digital Power Studio here:

https://www.ti.com/tool/FUSION-DIGITAL-POWER-STUDIO

Actually I would suggest making sure you install the Device GUI and use that to download and debug, if you are developing firmware.  If you are not familiar with the UCD, I suggest trying some of the training labs.

Here's a list of where to find some of the tools for the labs: training.ti.com/ucd3138-digital-power-training-series

Here's the video for the first lab, which just gets you set up with tools and a really simple code, and explains the code development process:

https://training.ti.com/getting-started-ucd3138-digital-power-controller-tools

Lab 2 https://training.ti.com/introduction-ucd3138-digital-power-controller-architecture-and-power-peripherals

Lab 3 https://training.ti.com/how-program-digital-filter-ucd3138-digital-power-controller

Lab 4 the video is in pieces.  Here they are in no particular order

https://training.ti.com/ucd3138-analog-front-end-afe-module-triggering-eadc
https://training.ti.com/ucd3138-analog-front-end-afe-module-afe-reference-dac
https://training.ti.com/ucd3138-analog-front-end-afe-module-introduction-analog-front-end-module-afe
https://training.ti.com/ucd3138-analog-front-end-afe-module-error-adc-eadc-overview
https://training.ti.com/ucd3138-analog-front-end-afe-module-setting-open-loop-board-closed-loop-demo

Thank you Ian.