It looks like the WIP Companion mod is only nonfunctional due to some [redundant?] graphics files that were removed in the most recent game update. If you re-add the Factorio/data/base/graphics folder from the last stable update (no replacing, just paste it in and skip replacing files), WIP Companions (and some other affected mods; I know there's at least one from Schall's suite) will run without issues.