On a second attempt, following your very useful suggestions, I was successful. Catalina with Frescobaldi 2.20 and LilyPond-devel are now operating normally.
Many thanks to all contributors Mario Bolognani www.baroquemusic.it > Il giorno 16 nov 2019, alle ore 10:43, Hans Åberg <haber...@telia.com> ha > scritto: > > >> On 16 Nov 2019, at 00:09, Mario Bolognani <mario.bologn...@gmail.com> wrote: >> >> After having installed Catalina I tried to install Frescobaldi plus LilyPond >> (the 64bit version provided by Hans Åberg) but, while Frescobaldi 2.20 >> 64bit apparently runs normally, I had no success with LilyPond… I am a >> musician not a developer so I’m not able to understand the reasons of this >> failure. > > Did you try this: > https://lists.gnu.org/archive/html/lilypond-user/2019-11/msg00295.html > >> So I am back to Mojave and the 32bit versions of Frescobaldi and LilyPond. >> Waiting for good news on the subject. > > Just waiting may not help. :-) > >