I have used Toast Titanium 12.1 in the past, with no problem.But now with new Mac Software High Sierra it is not useful at all. I have transferred most of my Video files to DVD or CD and burned them. Now it is more difficult , this I stopped to use the Toast at all. If you convert the Disk files to USB and try to save them to new format, you might be able to recover some.
Their customer service is bad, since Roxio sold them to Corel. You might have better luck with PC, but I have changed to iMac for 7 years, so I have not used them since 4/5 years.
Sorry I could not help. Thanks