Microsoft has issued an automatic update that fixes the problem for Windows 8 and Windows RT 8 while installing Windows 8.1 Update.
Earlier in April, Microsoft rolled out the major update for its desktop operating system, Windows 8.1 Update bringing significant changes. While the update was smooth for most users, some were having issue in installing Windows 8.1 Update. The issue was affecting Windows 8 and Windows 8 RT users.
The Redmond-based tech major has acknowledged the issue and rolled out an 'automatic update' called 'Pilot Programme' for Windows 8 and Windows 8 RT running devices, enabling users to install the latest Windows 8.1 Update, reports Winsupersite.
This (Windows RT) pilot program is an example of ways we're experimenting to help ensure more of our customers benefit from a continuously improving Windows experience. Similar to how the Windows 8.1 Update  process works today, the pilot program will automatically update consumer Windows 8 and Windows RT machines for free to Windows 8.1 Update and Windows RT 8.1 Update in select markets," said a Microsoft spokesperson.
Those who are facing the aforementioned issue should first try to download Windows 8.1 Update. If that does not work, then head over to Microsoft Support page to download the automatic update for Windows RT version. However, to apply the new update, the Windows RT device should have 2871389 installed.
"If you have enabled Automatic Updates on a computer that is running Windows RT and that has update 2871389 installed, this update can automatically start the update process to Windows RT 8.1," according to note at Microsoft Support site.
Download update: Windows RT version