OS12 and Brother MFC-7360N scanner will not work. Does anyone know a fix?

You should reach out to your printer's support for more comprehensive technical troubleshooting.

You can use this ticketing page if you are living in the US: https://help.brother-usa.com/app/ask/p/7312

Brother only lists support for as high as 10.5.

https://support.brother.com/g/b/downloadtop.aspx?c=us_ot&lang=en&prod=mfc7360n_allThe paid app Vuescan lists it as being supported. You can try it for free

https://www.hamrick.com/vuescan/supported-scanners.html