Considering that the update fixes Microsoft Store and application update issues, it is fair to say that this is not a critical update that you need to install right away unless you experience issues with the Store or app updates.
I recommend strongly that you create a backup of the system before you install the update. Advertising revenue is falling fast across the Internet, and independently-run sites like Ghacks are hit hardest by it.
Microsoft published the Support article in time, and it reveals what the update is all about.
The description reveals two things about the update: first, that it makes reliability improvements to Microsoft Store, and second, that it fixes an issue that caused application updates to fail and as a consequence have Microsoft Store generate "unnecessary network requests".
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Microsoft does not reveal which reliability improvements it made however, and whether it addressed other issues with the update.
KB4058043 is installed automatically if Windows Update is configured to download updates automatically for the operating system.
Users who want to install it right away can do it in the following way: Microsoft lists no known issues with the update.
It is too early to tell if the update has issues however.
After choosing to clear the event log (without saving changes…it wouldn’t let me because of invalid data), I kicked off the RACAgent task (Task Scheduler, Task Scheduler Library, Microsoft, Windows, RAC…change view to show hidden tasks).
When I went back into the Reliability Monitor I could now see the data for the last week.
That is a bit odd/frustrating…instead of reporting that in the monitor as an error, it gacked and hung the monitor.