If you are one the people who got the Windows 8.1 Update files from your MSDN subscription or from the internet then, you might have noticed that the files come in multiple sources. The format of the updates are .MSU which can be installed on any Windows PC.
Although, you can install all these updates one-by-one by selecting and installing them in the mentioned order but, this process can be a bit annoying as you have to install 6 different sources to get the complete Windows 8.1 Update installed.
But, for those of you looking for an easy way to install all these updates are at luck. There is finally a simple yet quick way to install all 6 of these updates in just one click of mouse. You wont have to open and install all these updates manually instead, you can just create a command line which will then install the updates automatically.
Just follow the instructions below to install the updates with just one click.
Before proceeding to the instructions, you will need to download the latest .MSU files from your MSDN subscription or from internet.
You will need to be running the
Windows 8.1 RTM to install these updates.
Instructions: First of all, upzip the folder you downloaded from the MSDN. Simply open the folder by selecting Extract All from the ribbon in File Explorer.
Once unzipped, you will get multiple .MSU files in the folder.
Now, here comes the best part which will let you install the files with one click.
Open up Notepad by searching for it while on the Start Screen. '
NotePad' will be showed in results. Open it.

Once Notepad is open,
copy and paste the following commands below to Notepad.
- For x86 (32 bit version):@ECHO OFF
ECHO: Installing KB2919442
START /WAIT Windows8.1-KB2919442-x86.msu
ECHO: Installing KB2919355
START /WAIT Windows8.1-KB2919355-x86.msu
ECHO: Installing KB2932046
START /WAIT Windows8.1-KB2932046-x86.msu
ECHO: Installing KB2937592
START /WAIT Windows8.1-KB2937592-x86.msu
ECHO: Installing KB2938439
START /WAIT Windows8.1-KB2938439-x86.msu
ECHO: Installing KB2949621
START /WAIT Windows8.1-KB2949621-v2-x86.msu
ECHO: Install complete press any key to reboot.
Pause
shutdown.exe /r /t 00
exit
- For x64 (64 bit users):@ECHO OFF
ECHO: Installing KB2919442
START /WAIT Windows8.1-KB2919442-x64.msu
ECHO: Installing KB2919355
START /WAIT Windows8.1-KB2919355-x64.msu
ECHO: Installing KB2932046
START /WAIT Windows8.1-KB2932046-x64.msu
ECHO: Installing KB2937592
START /WAIT Windows8.1-KB2937592-x64.msu
ECHO: Installing KB2938439
START /WAIT Windows8.1-KB2938439-x64.msu
ECHO: Installing KB2949621
START /WAIT Windows8.1-KB2949621-v2-x64.msu
ECHO: Install complete press any key to reboot.
Pause
shutdown.exe /r /t 00
exit

Once you have entered the command lines, save it by selecting
Save as from the file menu.

Here name the file
InstallWindowsUpdate.bat and save the file to the folder where you unzipped the .MSU files which you downloaded earlier.
Now, go to the folder where you saved the .bat file and open it. You would be prompted to install the update. Press
Yes each time you are asked and the updates will be installed automatically.
Tip: Once a single update has been installed, you might be asked to reboot your PC. Simply select
Restart later to avoid multiple reboots.
Once the installation of files has completed, you will be asked to restart your PC by pressing any key. Press any key on your keyboard and your Windows will restart. Windows will first configure your PC and install the updates. Once restarted, you will have the latest Windows 8.1 with Update 1 on your PC.
Thats all! Enjoy the latest update for Windows 8.1 with many new awesome features.
source:windows8core