Hi Mark,
Frescobaldi is able to handle several LilyPond versions at the same time.
*Edit --> Preferences
LilyPond Preferences
*
The path I'm using for 2.20, for instance, is:
C:\Program Files (x86)\LilyPond\2.20.0\usr\bin\lilypond.exe
plus "Include in automatic version selection" checked.
(in Windows 10)
There you can the full path to the various lilypond executable files and
there's a tickbox "automatically choose LilyPond version from the source
file" so that Frescobaldi will pick the most suitable version depending on
your \version statement.
And you can set one LilyPond version as a default.
It's a good idea to incorporate the LilyPond version somewhere into the
path.
That way, Frescobaldi is quite good at handling different LilyPond versions
in parallel.
Are your LilyPond Preference settings resp. "LilyPond versions to use"
entries OK?
HTH,
Torsten
PS: 0.4 is either prehistoric or some 2015ish LibreOffice OOo-lilypond 0.4
version.
--
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