Given how effective and appreciated this plug-in is, would be brilliant to get a workable version for 5.4.2!
Also, just for anyone's curiosity or food-for-thought; you can create a simple Actor that has an editor function that automatically parents all relevant imported geometry brushes / curves / groups / entities for a particular .map file (via searching a substring of the map name in each object's name), and then zeroes out the relative offset to the parent Actor. This allows you to manipulate said Actor as the origin point, like a group, and move it around within your Level. This solves having to keep manually re-locating every import, if you wanted to shift the origin point, and helps keep each imported .map grouped under one parented Actor.