The Spring Update for Windows 8.1 has been added back to Microsoft's Windows Update servers, and we have the links for x86, x64 and ARM . These are official, and they are RTM.
You can of course opt to wait it out and let Windows Update work its magic sometime at the beginning of April when it'll be rolled out worldwide. Or take the plunge and install now, please do note that the updates require multiple reboots, and may also be pulled from the download locations at any time, like what happened last time.
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