Welcome to the forums waltzsingmatilda.
One way of doing this is to use VLC media player to play the slideshow dvd and pause the playback on the images as they come up. Then take a screenshot of the image. You find the control in VLC by clicking Video–>Snapshot. VLC is free to use: www.videolan.org
The default image format will be .png, but this can be changed to jpg if you wish in the Preferences.
The images will be saved in your Pictures folder.
The quality of these screenshots will be considerably less than the original pictures.
There may be other ways to get the pictures, so wait a bit and see if anyone else has better options.