So I recently discovered when attempting to get Active Directory Users and Computers installed on a Windows 8.1 machine, that the update claims it is not applicable to my computer, even though the update is not already installed, and is applicable.

I am using a windows 8.1 64bit machine, and attempting to install ” Windows8.1-KB2693643-x64.msu” package.

What had to be done was the following:

Put the .msu package into it’s own directory by itself. EX: “C:\temppackage\” .
Ensure you have a C:\temp\ folder created as well.

Next, we need to extract the .msu so we can access the .cab file inside directly.

cd C:\temppackage\
expand -f:* “.\Windows8.1-KB2693643-x64.msu” C:\temp\ 

Next we need to install the package via Dism util like:

Dism.exe /Online /Add-Package /PackagePath:Windows8.1-KB2693643-x64.cab

This will run and show a progress bar. Once 100% complete you will have the Remote Administration Tools package successfully installed, and will see the available snap-ins within your MMC console.
Cheers!