windows 8.1 update unable to install kb
2] KB2939087 recommends in case you are unable to install the Windows 8.1 Update package KB2919355 via Windows Update, then you should download and install the package manually. 3] If you receive Error 0x80071a91 when installing KB2919355 on Windows 8.1, Microsoft has released a patch to fix this issue.t should therefore first be installed on your system before your attempt to install Windows 8.1 Update or KB2919355. Go get it here if your computer does not have it. 1] If your Windows 8.1 Update has failed to installed, you need to clean up the corrupted installation.