- Are the GUI app and BasiliskII itself in the same folder?
- Are you trying BasiliskII in macOS 10.12 (Sierra)?
- If so, did you try the workaround for starting the newly downloaded app files for the first time in Sierra as described above: Copy the application files (only the two application files!) to the desktop. Remove the original files, then move the copies back in place of the original files.
Quote:
i had to add a zero for DiskTools_MacOS80.image
The name doesn't really matter as long as the name in the entered path matches the name of the file. It should work without the zero added.