You can copy the whole Dorico 4 folder from /Users/your-username/Library/Application Support/Steinberg, but be sure to open preferences.xml in a text editor on the new computer and make sure the <autoSavePath> value is correct for your new computer, i.e. that the folder for your user account is correct and matches your username on your new computer.
I’ll be doing this soon, but for a new Win11 system.
Actually, my current computer is Win7pro (!) running v3.5, obviously, but the new computer will be Win11 running v4.
Is the migrating procedure the same as above? @dspreadbury
Yes, though on Windows the folder location is different. You’ll find it in %APPDATA%\Steinberg\Dorico 4. Again, be careful to check the user account name segment of the auto-save path in the preferences.xml file on the new computer.