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The may be a firewall or security setting on the Windows 10 computer that is not allowing the files to install. I would recommend contacting Microsoft and let them know that your Windows 8.1 had no issues install the scanner driver. They will be able to troubleshoot your Windows 10 computer.
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07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM