For anyone encountering issues with Samsung Xpress M2020W driver installation on Mac OS 27 and previous versions, here's "the" fix:
option 1: https://www.samsungsetup.com/ts/client/en/install.html
option 2: https://drive.google.com/drive/folders/1_BhKgrZYoOQuVhKPykYIOaFFmeYVuIMT?usp=share_link
For wifi printing, set up works over 2.4Ghz wifi only.
Hope it will help :-)