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Originally Posted by ElDiabloJoe
Weird, so I went through a coupla updates this morning until it stopped and told me no more updates were available. Here's the current status (image below). For reference, it's a MacBook Air, 2018 Retina 13-inch, 1.6GHz Dual-Core Intel Core i5, w 8 GB memory.

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No compatible. Here you go.
5 years of 100% compatibility seems to be the Apple standard, although it varies with the product.