If you own one of Microsoft’s Surface devices and you’re wondering why you can’t upgrade it to the Windows 10 May 2020 Update, you’re not alone.

Microsoft has made the update available to some of its devices, but not all, at least where PCWorld’s test devices are concerned. And it’s not always obvious which devices will receive it and which won’t. But even some of Microsoft’s latest, most premium devices aren’t receiving the update, which has been under testing for months.

On our test devices, neither the Surface Book 2 nor our Surface Book 3 test unit was allowed to download the Windows 10 May 2020 Update. The latter was explicitly blocked, citing an unknown issue in the message that appears at the top of this article. We’ve tried two Surface Pro tablets, however—the Surface Pro 4 and the recent Surface Pro 7, and both have been granted the update.

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