To convert a .dmg file to .iso on Mac OS is really easy.

Open Terminal and type (if your file is on the desktop):

hdiutil makehybrid -o ~/Desktop/outputFile ~/Desktop/sourceFile.dmg

NB. The outputFile DOES NOT have a file extension, only the source file has the .dmg extension.

This converts the .dmg to an ISO-9660 compatible ISO.

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