Endnote X8 on Mac OS 10.12.4 - cannot import RIS references from anywhere

I have only X8 on the machine. I do not know which filter is being used because everything is just on default settings. All I do is select import from the menu and nothing happens. How do I ascertain which filter is being used. Attached is an example of a typical RIS file that works in X7 without any issues.

ABLITT_LivingWithDementiaRelationships.ris.zip (1.01 KB)