Hi Gregory,
As Chris pointed out, it's (partially) up on CPDL. You might try
contacting some of the editors on
http://www2.cpdl.org/wiki/index.php/How_beautiful_upon_the_mountains_%28John_Stainer%29
to see if they'd be willing to share any of their scores with you. I see
Andrew Crookall, for instance, has withdrawn his score from the website,
but I don't know if it's SATB or not.
You could also try contacting the owner of the YouTube link you sent out.
Best of luck,
Sam
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