I am trying to install the latest Datasmith app 5.0.3 v2 for Revit 2020
But when Revit starts I get this error "Revit cannot run external application "DatasmithRevitExporter". Contact the provider for assistance. Information they provided to Revit about their identitiy: Epic Games, www.epicgames.com.”
Apologies for this issue. This is an issue with the 5.0.3v2 version of the Datasmith for Revit plugin that occurs on Revit 2018, 2019, and 2020. This should be fixed in the next plugin update. For now, please download and use the 5.0.3 plugin from https://unrealstudio.epicgames.com/UnrealDatasmithRevitExporter_5_0_3.msi.