None of their content is for a TB of 3.7. Both Dave and Euphod have,  except for routes, tended to build their content for the version of  Trainz at least a couple generations behind the latest. Routes are a bit  different by nature of how they work. Since it's generally not necessary  for content made or repaired for modern Trainz to have a TB above 2.9  (TS2009), hopefully you won't see this error too often, but setting  Minimum Build Version in CMP can help you rule it out.