Scrivener purchases

I asked this question over a week ago in help note but never got an answer so I’m asking it here. I purchased Scrivener for my Mac awhile back but don’t know where the serial is to upgrade. The price is low enough so that I don’t mind paying for it again, ONCE, but since I also use an iPad as well as a PC so I need to switch sometimes. Will the serial work on each, or does this clunky system now require that I buy it three times over? That would be unreasonable and out of synch with the way most programs are working nowadays. Either way
I would like a straight answer so I know what to do.

Does this help?

And also:

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