Hi,
Can you please download .NET Core 3.1.401 , then install it, perform the registration of those two files again and see if it works?
Best regards,
Eusebiu
C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools>gacutil -i "c:\Program Files\dotnet\sdk\3.1.401\Sdks ...