You can download the diagrams of the whole project from this wiki page.
There's a small diagram containing the classes. This is not the [Class Diagram and Set Up]! It's for a quick inspection. Link: https://sourceforge.net/projects/softwaretechnologykovcsmt/files/Classd_overview.png/download
You can look at the [Class Diagram and Set Up] here. This contains all of the classes and enumeration types. Important: Exception enumerations are not on the class diagram, but every class has one.
Link for the class diagram: https://sourceforge.net/projects/softwaretechnologykovcsmt/files/Classdiagram.png/download
You can fing the State Machine Diagram under this url address: https://sourceforge.net/projects/softwaretechnologykovcsmt/files/StateMachine.png/download
I made two sequence diagrams. The first is just running the program. The second is a little bit tougher to understand, it's about adding a new row to an existing and already loaded table of a database.
First link: https://sourceforge.net/projects/softwaretechnologykovcsmt/files/sequence_run.png/download
Second link: https://sourceforge.net/projects/softwaretechnologykovcsmt/files/SdAddnewrow.png/download
The old use case diagram is here: https://sourceforge.net/projects/softwaretechnologykovcsmt/files/Usecasediagram1.png/download