How does one go about adding the English subtitles to these ISOs so they work with the built in menu? They don’t seem to come pre-loaded in the ISOs, as the selector won’t highlight “ENGLISH”, and neither VLC for the DVD, or Leawo for the BD, seem to find any subtitle tracks.
The download page includes subtitle files and says to “add them to the DVD/Bluray ISOs on your own”, but gives no instructions on how to do that.