If you receive a message about not being able to get a license after opening a project with Modeler Tau edition then check the path to your license file in the registry.
Here are the steps:
From Windows Start menu select Run.
Type regedit in the run dialog
In the registry editor browse to HKEY_LOCAL_MACHINE->SOFTWARE->FLEXLm License Manager
In the right pane is a variable TELELOGIC_LICENSE_FILE. Right click on it and set it to the path of your license file.
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