Can’t get the Windows 8.1 Update from the Microsoft Store? Have an administrator issue? Here’s one solution.
Hit the Windows key + R
Enter control userpasswords2
Highlight the account and click properties (Note: If you are logged in with your email, create a new account and click properties to make sure the account is an administrator.)
Make sure you are an administrator. If necessary, create a local account and make sure the account is an administrator.
Important – After the update, you should go to Computer, Right Click the C: drive, select Drive Cleanup and get rid of previous versions of Windows. Also don’t forget after the Windows 8.1 update, you must get the Windows 8.1 UPDATE.