I’m having the same issues as everyone here. I’v updated from Revit 2018 to 2018.3 so the security fix won’t install as it is the latest version. The updates for ‘Revit Personal Accelerator Security Fix for Windows 7/8/8.1 (.Net 4.5.2) – version 22.214.171.124’ and ‘Autodesk Licensing Service’ have also been installed but with no joy. I dropped the firewall temporarily to see if there was a block but the same result as above. My Dynamo versions are 126.96.36.1992 for both Core and Revit.
Are there any other solutions to this? Thank you.