Myron, a few months ago I saw this thread in the DL forum, and it worked for me, so look near the end of thread for info about updating PLEX:
You will look for this part in the thread:
rodmichael
Jul 17
Found the anser for Updating Plex , (a hot link in thread to P:LEX forum; click on it.) it works perfectly:
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Download the update for your WD NAS to your computer(a *.bin file).
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Open your My Cloud User Interface.
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Navigate to the Apps Page.
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Select “Add a new App” (the small box with a “+” on the lower left.)
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Select “Manually add a new App.”
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Navigate to where you downloaded the update file (*.bin).
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Select the *.bin update.
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Follow instructions from there.