So, I need only one Mega Supporter Licence.
Thank you @vitor
I missed that.
My search failed - I presume because I used the noun spelling «licence» instead of the verb form «license»
(1) I have: 2 iMacs, 1 MacBook Pro, and 1 MacBook Air.
How many licences do I need to purchase to cover 4, 3, or 2 of these?
(2) Where can I find a simple description of the different types of licences?
Al Maloney