Problem

When creating a new ISM Repository from Revit you might get Operation Terminated Prematurely error.

Exception details: There was an error reading from the pipe: The pipe has been ended. (109, 0x6d).

Solution

The installation may be corrupt for the ISM Revit Plugin, or Structural Synchronizer, or Microsoft .NET Framework 4.7 could be missing.
Uninstall ISM Revit Plugin, Structural Synchronizer and check to see that .NET Framework 4.7 is installed.
Reboot your computer and install the ISM Revit Plugin and Structural Synchronizer.
Here are links to the installation files if you need them.

ISM Revit Plugin CONNECT Edition v.10.02.02.26

https://store.bentley.com/en/products/iware/1000ISMRPI--ISM-Revit-plug-in

ISM Structural Synchronizer CONNECT Edition v.10.02.00.140

https://store.bentley.com/products/iware/1000STRS--Structural-Synchronizer

Microsoft .NET Framework 4.7

https://www.microsoft.com/en-us/download/details.aspx?id=55170