Kb2919355 not in the list.
That tells us something about the version of your OS. Unfortunately RT users cannot use winver the way that W10 users now do but there are clues available in PowerShell... Even $PSVersionTable doesn't give us really current information but I bet mine is more current than yours with that one. (I'm annoyed because I remember writing a more complete description of this exact same analysis recently but as usual Answers won't let me find it.) Otherwise, one technique we have is using msinfo32.exe for its Loaded Modules list, sorting by Version and finding something about our maintenance that way. For example, one module that gets updated frequently is wininet.dll. Let's compare and see what the results imply. Here's mine: (I have to transcribe this because I am writing on W10 and do not have a cross-domain clipboard facility set up.)
PS C:\windows\system32> (Get-Item wininet.dll).VersionInfo.ProductVersion
11.00.9600.18538
In fact, depending on how the refresh you did is packaged, I suppose you could be completely up-to-date and not need to have a reference to KB2919355. But that would also depend on whether every module referenced by KB2919355 was superseded by something else and that is something that I don't know. I also don't know how to query what update brought me that version and hence have to resort to web searches in the Support site to try to find that information. Here is an unsuccessful attempt at doing that.
windows rt "11.00.9600.18538" site:support.microsoft.com
The problem with that will be that now they are not including File Information in the KB articles, just links to .CSV files which contain it. This makes the lack of the DLL Help Database even more irritating. I am going to quit this and try to calm down.
HTH
Robert