How to fix Windows Update with error code 0x800705b4

Question

Hello, I am a Windows user. I encountered an issue while updating to Windows 10 version 20H2; when the update reached 99%, the following error appeared: "There were some problems installing updates, but we'll try again later. If you keep seeing this and want to search the web or contact support for information, this may help: (0x800705b4)." Please let me know what the problem is.
Windows 10 Enterprise Build 10240
2GB RAM
500GB HDD
Intel i3-4005U

Apologies if any wording is unclear, as I am using Google Translate.

Thank you in advance for any answers.

Answer 1

Your Windows version is over 5 years out of date, that is causing the update problems, all normal methods to update your Windows version will fail, you will need to backup your files, create a bootable Windows 10 USB and use that to install the latest version of Windows 10.

Answer 2

Error 0x800705b4 means the update took too long to install or was interrupted.

For this Windows Update error, use this order:

1. Run the Windows Update troubleshooter
   • Go to Start > Settings > Update & Security > Troubleshoot > Additional troubleshooters.
   • Select Windows Update.
   • Select Run the troubleshooter.
   • Complete the on-screen steps.
2. Check the Internet connection
   • Go to Start > Settings > Network & Internet > Wi-Fi.
   • Confirm the device is connected properly.
   • If disconnected, reconnect and try the update again.
3. Reset Windows Update services and cache
   • Press Win + R, type services.msc, and press Enter.
   • Find Windows Update, right-click it, and select Stop.
   • Open C:\Windows\SoftwareDistribution.
   • Delete all files and folders inside that folder.
   • Return to Services, right-click Windows Update, and select Start.
4. Temporarily disable antivirus or firewall
   • Open the antivirus or firewall app from the Start menu.
   • Use the option to disable or pause protection for a short time, such as 10 minutes or 1 hour.
   • Try Windows Update again.
5. Restart the PC
   • Restarting can clear other apps or processes that are blocking the update.

Since the update stopped at 99%, this also matches the guidance for updates that get stuck near completion: check for updates again after running the troubleshooter.

A separate known issue exists for some devices after updating to Windows 10, version 20H2, where going back to the previous Windows version within the uninstall window can mitigate the issue.

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• Troubleshoot problems updating Windows
• After updating to Windows 10, version 20H2, you might receive an error when accessing the sign-in options or users MMC snap-in