This addon outputs better texture maps (in my opinion). To use custom images you have to follow some steps, taking multiple pictures using different light scenario where you keep the camera at the same place.
You can get a better instruction about it at: https://github.com/satoshi-ikehata/SDM-UniPS-CVPR2023#step-2-image-acquisition
To get the addon, just download from this link: https://carlosedubarreto.gumroad.com/l/sdm_unips
or get it attached on this post