Now you must specify the location of the ACM so that Revit can access the additional RPC content.
In Revit, click Options.
In the Options dialog, click the Rendering tab.
Under ArchVision Content Manager Location, select Local.
For Executable Location, specify the location of the ACM executable file (rpcACMapp.exe).
By default, Revit attempts to connect to the ACM using the IP address 127.0.0.1 (the local host) and port 14931. If it cannot connect to the ACM there, it attempts to start the ACM executable that you specify here.