As far as I can tell, the old and the new apps perhaps share some of the same preferences, and library, but they seem to coexist here on the same machine... haven't opened both at once, but the alias for the old version successfully finds the old version that I moved to the desktop on macbook pro, and so far, I see no flames or smoke....

IF having both versions installed at once will have silly consequences, someone please let me know... but so far, very short time, nothing has died on me