Following your directions, I ran
WD SmartWare Uninstaller.app. This time, it immediately stopped, reporting that 'An unknown error occured.'
Software for Mac. Showing 1 - 6 of 6 results Microsoft 365 Family. Rated 4 out of 5 stars. There are 8462 reviews 8K. From $99.99 per year. One convenient subscription for up to 6 people. Includes premium Office apps, up to 6TB of cloud storage – 1 TB per person –. Select the Uninstall check box on the WD SmartWare Installer for Mac screen to display the Uninstall WD SmartWare dialog: 3. If you want to keep WD Quick View installed to discover network-attached WD storage devices and provide drive status information, clear the Uninstall WD Quick View check box. Download and install GoodSync. To be able to run GoodSync for WD on Windows or MAC computer, you need at least one locally accessible WD device or one remote WD device registered with your GoodSync account. For assistance with doing this see Answer ID 3835: How to remove (disable/hide) the Virtual CD (VCD) for Windows or Mac OSX on a WD My Book. Panel de control Western Digital SSD. Software Acronis True Image WD Edition. WD Sync para Windows. Software para Mac Actualizador de firmware WD Universal para Mac. Install WD Discovery for Mac. Our software library provides a free download of Smartware 1.0.0.6 for Mac. The most popular version among the application users is 1.0. The most popular version among the application users is 1.0. Our built-in antivirus checked this Mac download and rated it as 100% safe.
Again, I ran
WD SmartWare Installer For Mac.app, version 1.3.4.6.
Again, it did not offer any uninstall option.
So, I asked it to REINSTALL SmartWare. This proceeded promptly to completion, reported success, launched the Smartware app, and began classifying files. I quit the application
I again ran WD SmartWare Installer For Mac.app, version 1.3.4.6, and this time it DID offer an uninstall option, which I chose. This time, it ran promptly to completion and reported success. Smartware-related items in Application Support and in LaunchDaemons were removed. BUT
/System/Library/Extensions/WD1394HPDriver.kext
/System/Library/Extensions/WDUSBHPDriver.kext
WERE NOT REMOVED.
Either the uninstaller does not work properly, or the uninstaller leaves those files in place for a reason. I don't know how to tell which it is. The files in question are copyright Western Digital, but this directory normally does contain some third-party files, for example, a bunch of ATTO drivers. Google does not find me any clear descriptions of what these files do.

Can you confirm that your system, which does not contain these files, DOES contain an external Western Digital drive and that it works properly without them?
Nov 9, 2013 8:29 AM
WD SmartWare is a utility designed for backing up data on West Digital(WD) devices. Sometimes, it works well and sometimes it fails. Here are some common WD SmartWare problems reported by users:
When facing all the above frustrating situations, you will feel happy to find an alternative to WD SmartWare Backup that works steadily and offer full compatibility with Windows backup software from EaseUS, a company enjoys a high reputation and millions of users in data backup & recovery are recommended.
The program supports system backup, file backup, application backup, email backup, schedule backup, incremental backup, etc. And it fully supports Windows 10/8/7 and other Windows versions. For all of these advanced and flexible backup features, it can not only help you avoid all the possible problems and limitations of WD SmartWare but also offers you a more comfortable backup experience.
Step 1. To back up an entire hard disk or simply its several partitions, the best backup plan is 'Disk/Partition'. Choose this backup mode and let's begin.
Step 2. On the popup window, choose the hard drive or partition(s) you're going to back up. A check symbol appears after you clicked the mouse.
Step 3. Click the 'Browse...' button in the 'Destination' area to choose a backup location. Here, you can choose any location that is available to you, such as the local hard disk, folders, Network drive, NAS device or Cloud storage, including GoogleDrive, DropBox and OneDrive. You can explore all the connected drive by clicking the icon in front of each directory.
Step 4. Now edit your disk backup image by adding a 'Plan name' and 'Description' to it.
Do not forget the advanced backup plans in 'Backup options', where you can compress the backup image, encrypt the backup for privacy protection and even enable a sector by sector backup.
At the same time, you can turn on the 'Schedule' in order to create a hard disk/partition backup on a regular basis like daily, weekly, monthly or upon an event according to the schedule set on your own.
And the 'Image-reserve strategy' lets you manage the increasingly growing backup images economically, you can preserve the backups in a setup time or quantity.
Step 5. Not all the customizable hard disk/partition backup solutions are necessary but try to make full use of the necessary ones. Finally, click 'Proceed' to start at once.
For safety, disconnect the physical storage device you used as a backup drive after the backup process is over.