Here is what I did.
After I restored my Windows 10 drive to a new partition.
Injected drivers: but make sure to select the Windows Support folder, not the WinPedDriver or it won’t find the drivers.
Reboot into bootcamp
3: open the old windows support folder (from my older macbook pro 15 where I started.
Right mouse click ( I used an external mouse) on BootCamp.msi and uninstalled.
4: Install the new latest and greatest drivers. To get these, back in the Mac OS, I opened BootCamp Assistant and downloaded the windows drivers. This finds the drivers for themachine I’m on. the new 16 inch.
5: rebooted back into bootcamp and ran the new bootcamp installer
Opened Device manager and looked for Network controller ( not network adapter) and I deleted it. Then restarted and went back to device manager it was created again.
I opened the proerties and updated the driver. I had it search the Windows Support folder ( the new one).
Finally, it installed the broadcom controller.
Ok, so now… check this out, I had to go into my old windows support folder ( from my old Macbook pro 15) I copied that folder over and opened up Bootcamp/Drivers/Broadcom/ and installed the “BroadcomWirelessWin8x6.exe” and “BroadcomComController64.exe” I did this by double clicking and following instructions.
After that, I was able to restart and they appeared in my network adapters as options.
And my wifi was back.
But wait there is more.
At this point, I have wifi, but no trackpad, touch bar or anything else.
So, I went back into device settings and under Human Input Device, I selected each item, one at a time (there were like 15 of them, so it was a hassle). Each one, I updated the driver, and had it search my new Windows Support folder.
Most just did nothing, but then some showed a progress bar and actually updated. I learned that the bottum 7 items or at least some of the bottom 7 were the ones I wanted! They just were not labeled. As I updated drivers, it told me “touch bar” “Track pad” and such, and then once I did them all, I rebooted, and BAM, Bob’s your Uncle. My Macbook Pro was running windows 10, with all the mack trackpad, touch-bar, sound working normally.
It’s possible I missed something in this report, but I’m toast. I’ve been at this for hours, and just wanted to capture what I could in writing while it was mostly fresh.
I hope this is helpful to someone else who was in my shoes.