That's why I put the word officially in quotes.
However, thanks Jon.
I have a second (back-up) OS of High Sierra as an internal HD-drive on my Mac (in place of the CD-Rom drive). My primary OS is on an SSD. I may do some experimenting, even though the mac graphics card will probably be the culprit.
(I have a 13-inch, Mid-2010 Macbook Pro.)
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