I edited all of my home movies in Magix movie Edit pro. My PC died and I now have a Mac. Fortunately I had saved all of my files to Dropbox. How can I now access my edited files on my Mac.
. . . . How can I now access my edited files on my Mac . . . .
Assuming you mean Movie Edit Pro (MEP) project files you need to have MEP installed however it is Windows only, if the operating system is MAC OS then there are 2 options:
Installing Parallels or a similar Windows emulator, install Windows 10 then MEP, however there are potential issues with doing this particularly if you want to burn discs and some functions may not work.
the best option is to make the MAC dual boot using Bootcamp - this also means installing Windows 10 and MEP onto the second operating system.
MEP project files are only compatible with Movie Edit Pro and Video Pro X and both programs are Windows only.
Do note if you decide to do either of these options then you do so at your own risk.