Thumbnail database update

Using cam2pc 4.0.2 shareware (2 days)
I downloaded several pictures from my Canon A80. I edited one of those pictures in Paint Shop Pro 8 and saved it to a new name. When I went back into cam2pc, I noticed that it said "No" in the thumbnails column for that picture. I right-clicked on the image and chose "Update thumbnail(s)", but it still says "No".
I was assuming, maybe wrong, that this would create a thumbnail for this picture. Am I missing something or is this an option that is limited to the registered version?
I downloaded several pictures from my Canon A80. I edited one of those pictures in Paint Shop Pro 8 and saved it to a new name. When I went back into cam2pc, I noticed that it said "No" in the thumbnails column for that picture. I right-clicked on the image and chose "Update thumbnail(s)", but it still says "No".
I was assuming, maybe wrong, that this would create a thumbnail for this picture. Am I missing something or is this an option that is limited to the registered version?