<p>Want to get an advance look at what Microsoft has cooking in the first big update to Windows 8.1? You're in luck: The update is now available online, but not from Microsoft.</p><p>Several file locker sites now host the Windows 8.1 Update 1, thanks to an apparently accidental leak from Microsoft's servers. The company put the update on its public Windows Update servers so company employees could get the update, but it kept outsiders in the dark by labeling the files with non-obvious file names. However, with a simple software tweak, many were able to fool the servers into thinking they were Microsoft employees, letting them obtain the files.</p><p>Although Microsoft has since patched the security hole, the damage was already done. Copies of the update now reside on public file lockers, such as Mega, letting anyone download and install the software.</p><p>Windows 8.1 Update 1 isn't yet officially supported by Microsoft. Although the company issued the release to manufacturing (RTM) version on Wednesday, which represents the final version of the software before release, some hardware-specific drivers and links to as-yet-updated services may not work. If you're thinking about installing it, proceed with extreme caution.</p><p><a href="http://mashable.com/2014/03/07/windows-8-1-update-leak/">Keep reading...</a></p>