Hi,
The no pictures means that the demo pictures are not included in order to keep a lower file size. All the other pictures are included.
If an update is made on the database only the structure is changed and in some cases new content is added to make it visible for the users. The existing content of the database is not modified.
I've noticed that the last few releases has had pictures located in \j-businessdirectory_4.5.5-no-pictures\media\pictures\categories. I've just deleted them from the ZIP before updated.