Hi
There have been some improvements in rendering .ABC files in release 2020.1.5.163.
To render .ABC files you will need a Modo Alembic File item (specifying the .ABC file to load), and a Modo Alembic Mesh item.
The Alembic File item must have Geometry Scale set to 1. If you need to scale the item, use the Alembic File Transform->Scale.
The Octane Material applied to the .abc file will be that assigned as teh Default material in the Shader Tree.
Paul