"Revit makes available the following IFC-specific files:
- IFC Metric Template.rte. This file allows you to create new projects that are already set to the IFC standard.
- IFC Parameter Upgrade.rvt. This file enables you to upgrade an existing project to contain IFC parameters by reading the instructions contained in the IFC Parameter Upgrade.rvt file.
Shared Parameters.txt. This file contains the shared IFC parameters if
you want to manually update an existing project to contain all or some
of these parameters. Note: It is recommended that you use the IFC Parameter Upgrade.rvt file. If you use IFC Shared Parameters.txt, you must add parameters one at a time, setting the correct categories for each. If you use IFC Parameter Upgrade.rvt, you can use the Transfer Project Standards tool to add the parameters in one operation."
From Help: Access IFC-Specific Files
It will send you here:
And you can download IFC.exe from this direct link
which contains these files: