Updating to Windows 10, version 1903 still fails after required Intel RST update

Part way through the update to Windows 10 Version 1903 I get the error message

If your device has an Intel® RST driver version between 15.1.0.1002 and 15.5.2.1053 installed, it cannot install the May 2019 Update.

I performed the update to Version: 17.5.1.1021 (Latest) Date: 7/10/2019 and rebooted several time but the same message appeared during the update, I also tried a version 16 update with the same error message. I've checked the installation logs which confirmed that I had the correct version and also checked in Control Panel/Programs and Features for the installed version.

I initiated the updated using Settings/update&Security/Windows Update and clicking the button

Answer

Installing the latest Intel RST driver seems not to work. After clicking on the Refresh button the Installation Assistant still indicates that there is an old Intel RST driver installed. Rebooting the Computer also does not help.

I was sure I have installed the latest driver so I stopped the Windows Update Service (Windows-Logo-Key + R; services.msc; Enter;). While the service is stopped I have deleted the SoftwareDistribution-Folder (C:\windows\softwaredistribution). Then I started the Windows Update service again. Windows will download the 1903 Upgrade again and there won't be any errors anymore while installing the new OS.