If you want a quick way to access this macro, in Word go to "File", "Options" and select "Quick Access Toolbar". Under the drop-down menu "Choose commands from" select "Macros" and you should see the Normal.Module.OldStyleSpellCheck. Select it and click
the "Add > >" button to move it to your toolbar. You can use the "Modify" button to change it's appearance.
After hitting OK you'll see the icon for this macro along the top of word in the Quick Access Toolbar. You can click this instead of the usual spell check button and it will run the "old style" word spell check window, allowing you to select "ignore rule"
as you always could!
Would be nice if Microsoft incorporated this feature into the new UI instead of required such a rigmarole to get to it.