I do not know anyone who has another Mac. dmg file and put that onto a CD to bring to my Mac already mounted. HELP! The only thing that I have read to do THAT I HAVE NOT DONE is find another Mac that can mount the. dmg files it came up with the warning message, Disk failed to mount. Right-click the DMG file in the left panel and select 'Convert'. You should be able to see it on the left panel in Disk Utility. Open a Finder window and double-click on the DMG file to mount it. Launch Disk Utility in Mac from Applications > Utilities. Follow the steps below to convert your disk image files: Step 1.the only other solution that i can thin of is to put this HD into the other Mac and try to install it there. i downloaded TransMac on my other PC and made the USB bootable from that, using the same. Also it doesn't let you transfer more than one file at a time, so it may just take forever to get the job done. Android File Transfer Mac by Google is the only native utility that could be rather helpful in file transfer, but unfortunately it has not been updated for several years and the interface is not easy to understand.app file to “/Applications/” on your Linux machine then launching it through Darling’s shell commands. If you want to run an app from the Mac App Store, copy the. To attempt to run a macOS program, first download the appropriate files.