Thank Richard and Thomas, it works! I report here what I did in case others have the same problem (and like me are beginner): - open the file changePitch.ly in frescobaldi - then menu "Tools/Update with convert-ly..." - in the dialog box, in the "From version", enter 2.18.0 and in the "To version" enter 2.19.35" etc.
Best regards, g.
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