Just download and install the new setup-utility and it will install 12.1.10, at least it did here.
In my experience older setup utilities sometimes don't offer an existing update.
Uli
No, I know of no other source. I just did it yesterday, but it was a fresh installation of Windows 8.1 Preview. To be honest, I was checking if the 12.2.3 version was already avalaible which is mentioned somewhere in this forum. But it is still 12.1.10
Uli
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