Panasonic KX-TG5566M telephone - Having trouble installing driver from CD disk

Hello,

Back in 2007 I bought new a 2005 Panasonic KX-TG5566M 5.8 GHz Expandable Digital Cordless Phone. The cordless handset contains small emoticon images that I can associate with any phone number that I program into my telephone handset such that they appear with my Caller ID info when a call arrives from that person. I can also select from images on my PC to this handset, using the USB cable that came with the phone to connect them together then download, although I have never done it before to this phone.

But now I would like to download images to this handset for the first time and that is where I am running into trouble. To do this, I first have to:

1. Install their GIGARANGE USB Utility for which I have the CD-ROM disk (never used before).
2. Connect my handset to the PC.
3. Install the USB driver from the utility disk.
4. Start the GIGARANGE USB Utility (a small dashboard)

then proceed from there.

Well, my desktop PC is Windows 10 and this older phone has instructions only for Windows 98SE, Windows Me, Windows 2000, and Windows XP.

Here are the instructions for the 4 steps above:

Using Windows 10, when insert the Utilities disk (step 1.2), I get a pop-up asking me what do I want to do, one choice listed is to run the Setup.exe on the disk, this is step 1.3. I do so and get an Installation Wizard, but when it is done I get this popup with no explanation:

I restart the computer and see in the taskbar the icon for the GIGARANGE as if jumped to Step 4. So, I open the dashboard, I can open the Picture Utility, and I can download an image from my PC to this Picture Utility. But, no other buttons on that Utility screen operate. I can't do anything further. No driver?

With disk still in the CD drive, I can go to my PC and click on  the icon for my attached handset, and when I get to driver, it says no driver installed. IT SKIPPED STEP 3. I click on update driver but my computer cannot find the driver on the Disk where it clearly is, in a folder called "driver", shown as pccusbd.sys.

I note that I never saw the Found New Hardware Wizard mentioned in Step 3.2 but isn't that just for Win XP? I also cannot perform the Troubleshooting on Page 4 of the document because it uses WinXP nomenclature.

I think my problem is that I don't know how to get this old Utility program to access its own driver using Win10.

Does anybody know how I can accomplish this?

Thank you.