I'm running Windows 10 10240.
The 1511 update does not appear in windows update for me.
I tried downloading it from Microsoft Update Catalog but when I start the installer it says that it's not applicable for my computer.
Media creation Tool and Techbench are both updated with Version 1511.
The Techbench provides ISO's, so does the media creation Tool.You have both of the options, try anyone of these.
Or Media Creation Tool:
The size of the update through Windows update and ISO are nearly the same.
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