Yeah it was you, DIM installs a directory structure that looks like this,
Install Manager
Packages
Thumbnails
ManifestFiles
I have never seen anything in
Thumbnails and
ManifestFiles is basically a log of everything you installed and when. If you pull a file from here or other sites, take the
.rar file and open it with either WinRAR or 7Zip then drag and drop the internal
.zip file into the
Packages subdirectory. DIM only works with
.zip files with an internal file structure that is similar to your DAZ library. Everything originating from the DAZ store is in this format. Almost everything originating from Renderosity is also in this format. Almost nothing originally from Renderotica is in this format and is better installed manually.
If you buy something from the DAZ store, it can automagically add the file to the Ready to Download tab in DIM and it is easy from there.
So basically DIM does not 'search' for files to install in your DAZ library, it only looks in the specific
Packages location. If it isn't there DIM doesn't know about it.