One potential fix for failed installs of KB4093112
Unfortunately, the more systems get this update, the more users confirm the failed installs, and as we’ve told you already, the typical behavior is experienced every time: KB4093112 downloads correctly and prompts the user to reboot the system only to then fail with various errors, undo changes, and return to the desktop.
The same cumulative update is then re-offered and Windows Update requires another system boot, only for KB4093112 to fail again and pretty much pushing the computer into an infinite loop.
Microsoft hasn’t said anything about how users can address these problems, and there’s a chance nothing will be shared until the next cumulative updates ship on the May 2018 Patch Tuesday.
In the meantime, the hundreds of users who took to the Microsoft Community forums to complain about issues with cumulative update KB4093112 came across a workaround that seems to fix problems on a number of systems.
In the Command Prompt window, you need to enter the following commands one by one and press Enter after each of them (you should copy and paste them from the box below to make sure there’s no typo):
Once you enter all commands, you should restart your PC and try to download and install the update once again from Windows Update.
If this workaround doesn’t make any difference and KB4093112 still fails on your system, you could try downloading the cumulative update manually from the Microsoft Update Catalog. This link points to the download mirrors for each version of KB4093112, so check twice that you get the correct one for your system.
Additionally, in the case of systems that are already up-to-date and running the March 2018 cumulative updates, you can also download and try to install the delta updates for Windows 10, also available in the link above. Delta updates only include the changes that Microsoft developed since the previous patch, so they come as lighter packages.
Furthermore, since they include fewer changes, they’re less likely to fail to install, possibly helping users who are hitting issues with KB4093112 to bypass them.
The next Patch Tuesday takes place on May 8, but other cumulative updates are likely to be posted later this month with more improvements and fixes (but no security patches though). It remains to be seen if these updates will install correctly though.

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