The old EVO video format featured in certain Toshiba devices is not that well supported in multimedia converters, so finding one could be really tricky. However, once you have found a converter (some choices are listed below), it should be really simple to convert evo to mkv, or any other suitable multimedia format.
Convert HD DVD video to Matroska multimedia container.
We found one software available in the database for this conversion.
Apple macOS / Mac OS X software - convert evo to mkv on OS X
Universal video converting software for Mac
Convert from evo file format
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.