Using "Digital Pointy" brush, I got pressure sensitivity to work with "WinTab" driver in OurPaint, and "Let me use my pen as a mouse when it's available" set to ON in Windows Pen settings (Windows 11)! I didn't realize the default "OurPaint" didn't really show pressure sensitivity, is this part of the "programmable, featureless, node-based" brush concept? If so I shall have to dig into this deeply and see how to make brushes that show the pressure sensitivity by default and change all your nice preset brushes! Thank you for your help!
Unfortunately the program keeps crashing if I switch brushes and try to draw much more than a few strokes.
Also, I opened Blender 3.0.0, and if you are curious, it seemed to work just fine, and I was able to adjust pressure sensitivity with the download program from Huion. It worked whether mouse pen option was on or off in Windows Pen settings.