This Error comes up when I am trying to create a Road Surface Model. Any Ideas. I just installed 5.20 this morning and was trying to get files together for a project. I did not have this problem in 5.10
When you installed 5.20 did you enable the following option? These are now optional as they require system files that are more than 10 years old and no longer supported by Microsoft, hence may not get updated for security concerns.