The Unreal Material Importer is a plug-in for Unreal Engine 4 that you can use to load Modo material .xml files and apply them to 3D meshes of a game level in the Unreal Engine 4 editor.
Binaries and source code on the master branch are for Unreal 4.11.1. Older versions are zipped in legacy_unreal_versions branch: https://github.com/TheFoundry-Modo/UnrealPlugin/tree/legacy_unreal_versions
For installation and other information, please read documentation here: https://help.thefoundry.co.uk/modo/#help/pages/appendices/unreal_material_importer.html