I'm having difficulty installing a printer.

If I go to the Brother website it gives instruction to download a Driver Install tool which leads to a download page. Typing in the model number in the search box gives this error:

An unexpected error occurred. 
We are now investigating the problem. 
Please wait for a while.

Waiting for a while does not help.
I have another printer installed on socket://192.168.0.28, so I think I should try to install it via AppSocket
If I go into CUPS and select Select Device > Network Printer > Find Network Printer > AppSocket/HP Jetdirect, then I don't what to enter for the host.

$ lpinfo --include-schemes dnssd -v

returns nothing

My linux version:

~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.3 LTS
Release:    20.04
Codename:   focal


Can anyone suggest what to try?

Thanks!