I don't know how Movies DVD 7 works (I use MEP 14+) so I can't give you an exact answer, but, try right-clicking on the video track (in Timeline mode). You should see "Video effects" or something like that. There is a slider called "Speed".
In MEP, you can slow down the speed 50% as the limit. To go slower, you have to "ungroup" the audio from the video, then you can take it down as slow as you want.
Well, I guess you could get the download or boxed version directly from the Magix webshop or a box from the retailer of your choice. Maybe you can also get a quote for a special upgrade price from Magix, if you contact their sales department: