I’m having the exact same issue for P/N WDBACX7500ABK device. I have 2 devices and one works (PN WDBBEP0010BBK). I have try to chance the cabels to identify is this related to cabel isse. I have installed several time the SES drivers. No luck. Can you let me know did you get a chance to resolve the issue?
Go here: Software and Firmware Downloads | WD Support
Choose x64 (windows 10 x64, windows 7 x64) to download the driver zip file
go to your downloads, right click the zip file and extract all
next, next until finished
Go back to downloads folder
open the unzipped folder called WD_SES_Driver_Setup_x64
double click to install WD SES Driver Setup (x64)
finish
I’m pretty sure people still would find this relevant in 2023. I just bought a 2TB WD My Passport. It showed up in My Computer in Win7 but Device Manager says not properly installed (!). A quick search led me to this page but when I followed the link to WD Support it was no longer there. Digging somewhat brought me to the right page below.