Brother Printer exists & works, but won't "Install" - Why?

Gang I have really appreciated how Windows 10 can pickup devices on the network and get them working without the user even knowing what happened. Saves steps. With multifunction printers, however, it is better in some cases to run the Manufacturers software stack for key important key features, in this case scanning multiple pages into one PDF. I have not seen a case like this one: The Device, a Brother MFC-L2707dw, is working - windows dropped it into Devices & Printers with no intervention, both by USB, and later by WIFI. The basic functions work. It will print, scan, and copy. But all not well.

The info on the printer is not populated other than the basic ID: it gets the model correct, all other information missing in Windows Devices & Printers. Most importantly, in trying to install either the Basic Drivers package or the Full Features package from Brother [they only list those two in Downloads for Windows 10], I have to quit the install because it cannot detect the printer. Fails when connected by USB, and fails when connected only by WIFI [and the printer works on WIFI as well as USB]. Similarly, if I delete the Printer and then use the "Add Printer" in Windows Control Panel, Windows 10 cannot discover the device. [but it does... just not the prescribed way]

I have not tried this in Safe Mode - I assumed drivers would be squelched and the package would fail again.

Anyone have a suggestion here?

C

Clean install of windows 10 v1909.
I did not check the router for a 5ghz band. Only one SSID was given, both devices on same.
I got a Brother rep on chat today and she's sending a few things to try

nope. no other defenses. in the chat session I had with some first line tech rep at Brother, I specifically asked about their contradictory statements about having the device on or off [reading their troubleshooting faqs and the readme's included in the install packages, they say both - no, and yes.]. the rep says it doesn't matter, but the best is to connect to wifi... here is her exact answer from the transcript: "Laura: The best practice is that one, to connect first the machine using the machine's control panel and then run the installation."
In other words, I did the right thing, so it should all work right [wash/rinse/repeat]

?
How about simply updating the drivers? Use 7zip to unpack everything, point to the folder, voila? even if that worked, it would not install the Scanner manager part of the Brother Control Center, which is looking for a device, and not finding one.

I appreciate the ideas.

Check whether I understood you well.
First try: Add new printer, Windows finds printer and loads its own drivers/programme automatically. It wprks but not with the Brother drivers.
Second try: Brother package: failed
I suggest a third try: Add new printer; the printer that I wanted is not listed; continue and see of your model is listed. in the list of printers.
I had difficulties with setting up another Brother printer, and the third try solved it.