Those of you talking about updates for build 10240 vs build 10525 are approaching this wrong. Think of build 10525 as basically a different OS from build 10242. Just like you wouldn't be surprised that updates for Windows 7 don't apply to Windows 8, you shouldn't be surprised that update for build 10240 don't apply to build 10525. It's not that build 10525 already includes those; build 10525 is a separate OS.
Update for Windows 10 for x64-based Systems (KB3081449) Update for Windows 10 for x64-based Systems (KB3081452)