I've searched the forum trying to solve this and don't see my answer yet. I am missing big Kittel's (and maybe a few other resources) but I have used the Beyond Compare program and all the *.logos4 files are on the HD of my new computer. Kittel is there too, only not showing up in My Library.
L4 reads 2,746 files on my older computer and only 2,735 on the newer one. Puzzling.