Solved.
Found a file:
C:\Users\Robert\AppData\Local\Temp\adb.log
Already existing, and did not pay close attention to the date stamp of 04/12/2019, I installed B4A on 09/10/2020. Must have been left over from an attempt to program Android last year, with a different program.
Deleted that old adb.log file, and BAM! now I can install the tutorial programs, and now the WYSIWYG works also finally.
B4A does not trap the error "adb.log file already exists, overwrite? Y/N?"
OK, back to the tutorials, after 2 days of struggle on that....