TDMT compares one geometry to another, to transfer morph targets between them.  Two different methods of comparison are used by the script, each with different options.  "Use Raycasting" will activate the raycasting comparison method, which can provide more precise results under some conditions.  The default option uses a sampling of "nearest" vertices on the source geometry to create morph targets for each vertex on the target geometry.  Raycasting results can be much better than nearest-vertex results, but nearest vertex works better when source and target geometries have dissimilar shapes.

"Distance Cutoff" is used with nearest vertex comparisons to rule out source vertices which are farther away than the submitted value.

"Number of Influences" determines how many source vertices will be used in a nearest vertex comparison.

"Test Normals" is used with raycasting to rule out source vertices which have normals pointing away from the normals of a target vertex.

"Test Using Base Geom" runs the normals test not on the current (potentially morph-deformed) shape of the source geometry, but on the un-morphed base shape.

The Restore Detail script may work best when run on a geometry which is not posed or transformed.  Zeroing the transforms of your actor (and its parent chain of actors) may give better results.

I was the author of Restore Detail and the co-author of TDMT.  Note that I have been away from Poser use for several SR updates now, due to Real Life complications, so it is conceivable that some recent change to Poser may be creating problems with Restore Detail.  What version of Poser are you using?

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.