Hopefully someone will write a sort of shell that will let old apps work. Burn has been one of my best tools for creating and copying CDs - especially audio CDs since Disk Utility won’t. And it lets you copy from one to CD directly to another if you have two drives.
But it was written for OS X 10.6, hasn’t been updated since
I guess I’m correct in that we won’t be able to run non-Mac AppStore apps either?
Toast Burn on the app store requires Lion and like the other Corel toast apps and MyDVD Pro is compatible with El Capitan. Toast Audio is also available if you only want audio CDs.
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They could avoid that problem if they allowed new Macs to run older operating systems. I'd love to buy a new Mac and run OS10.9, which was the last OS not to start causing cracks to appear in software I use.
VMware fusion, or even that half-baked Parallels Desktop, will do what you want. You can run both at the same time, with the Mavericks virtual machine running in an emulator app, all you will need is 16GB ram ideally so you can run everything well at the same time.