Although I tried everything said on this forum with no results, now I tried Greg Maxey's exelent work, his latest and revised version and saw a light of hope. I installed the 2016 file (I have Office 365/Word 2016) in Word's STARTUP folder as explained;
nothing happened. Then installed the 2013 file; nada. Then I restarted the computer and... voilá! when right-clicking the mouse, on the menu appears the option of "Auto correct". Almost cried with joy, BUT when selecting the "Auto correct" option the only
thing that happens is that a small empty square appears on the right, but nothing more; no options, no nothing.
Sigh.
(insert sad emoticon here)