Unfortunately, I can't find any mention of an updated version of Al-Mushaf for Desktop Publishing, so I'm guessing that the developer is no longer interested in working on the application.
However, you could try to work with the version that you have on a newer version of Windows either by running the application in compatibility mode (right-click the application's executable, press Properties, then go to the Compatibility tab, check the box marked Run this program in compatibility mode for, then select the desired Windows version from the drop-down menu and click Apply) or by setting up a virtual machine, installing an older version of Windows on it, then running Al-Mushaf for Desktop Publishing through said virtual machine.