Hope this saves someone else the headache. This old dock is still useful for non-graphic-intensive office work or adding a secondary screen.
SOLVED: Targus PA088E Driver for Windows 10 64-bit (DisplayLink) targus pa088e driver windows 10 64 bit
There is no "Targus PA088E Windows 10" driver. Targus stopped updating this model years ago. However , the hardware uses a DisplayLink DL-1x5 chipset, and the generic DisplayLink drivers work perfectly. Hope this saves someone else the headache