OS Model Builder - In Infraworks why are some of the Data Sources greyed out when I try to Refresh them?

Question:

In Infraworks why are some of the Data Sources greyed out when I try to Refresh them?

Answer:

The Data Sources in your 3D Model within Infraworks will need to be refreshed so that the Model shows the OS data that you have downloaded from the OS Model Builder. If a Data Source is greyed out, then the likely reason is that you have not downloaded the 3D Model into the following folder on your PC – C:/Cadline/Model/.