Hello Sipder, how are you doing?
Welcome to the Microsoft community!
I'm glad to be able to assist you at this time.
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I understand how frustrating it can be, but don't worry, we can try a few more troubleshooting steps to resolve the issue.
First, let's try disabling your antivirus and Windows firewall temporarily and then try installing the update again. Security programs can sometimes interfere with the update process and cause errors.
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If that doesn't work, you can try performing a clean boot of the system to check if any third-party programs are interfering with the update.
Press "Win + R", type "msconfig" and press "Enter". Select the "Services" tab and check "Hide all Microsoft services". Then click "Disable all". Restart the system and try installing the update again.
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If the issue continues, you can consider performing an in-place upgrade. This process involves reinstalling your operating system while keeping your personal files, apps, and settings intact.
It can help resolve any underlying issues that may be causing the error 0x800706be:
https://answers.microsoft.com/en-us/windows/for...
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The error 0x800706be can have different causes, and solutions can vary. However, these are some of the common steps that can help resolve the issue, especially if it is related to conflicts with security programs or third-party programs.
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Please let me know if this response has helped resolve your issue by selecting the "Yes" or "No" button below. Your feedback is greatly appreciated and will also assist other users who may encounter similar challenges.