Roxio Toast Titanium also supports the ISO format, so your best (and most likely the only) bet is to use the program to convert your TOAST images to ISO format.
Convert Roxio Toast disk image file to CD/DVD/HD DVD/Blu-ray disc ISO binary image.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software - convert toast to iso on OS X
Roxio Toast 11 Titanium makes disc burning, DVD copying and video conversion as easy as drag, drop and go.
Convert from toast file format
|Yes, Roxio Toast Titanium supports iso file conversion as a target file type.||Yes||No||No||Yes||No||No||Yes|
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.