Looking at the link given in step 5, it looks to me like .NET 4,8 is needed. You may want to try and install it.
Going methodically through all the steps outlined in the guide seems to be a good idea. Most people were able to resolve their issue that way.
I have been having the same error on Windows 10 with .NET 4.8 and no .NET 3.5.
All I did to fix it was reinstall RoonServer. Seems to have sorted it out.
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