On Fri, Nov 20, 2020 at 12:39 AM, Sieghard Weitzel wrote:

This might be an issue where Microsoft Accessibility could be of great help.

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Amen to that!   If you've got no-cost access to Microsoft support, it only makes sense to take it in a situation like this.  

Microsoft Windows & Office Accessibility Support
(800) 936-5900

U.S. Website:  https://www.microsoft.com/en-us/Accessibility/disability-answer-desk?activetab=contact-pivot%3aprimaryr9

UK Website:  https://www.microsoft.com/en-gb/accessibility/disability-answer-desk?activetab=contact-pivot:primaryr9

both of which give options other than phone for getting in touch.

I have strongly favored doing all Feature Updates using the following method for a very long time now:  Doing a Windows 10 Repair Install or Feature Update Using the Windows 10 ISO file
 
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Brian - Windows 10 Pro, 64-Bit, Version 2004, Build 19041
The purpose of education is not to validate ignorance but to overcome it. 
       ~ Lawrence Krauss