error in loading a lyx document in a newly installed lyx 2.4.0 -alpha3

[Wolfgang Engelmann]

Am 14.02.22 um 11:29 schrieb Wolfgang Engelmann via lyx-users:
> 
> 
> Am 14.02.22 um 10:44 schrieb Jürgen Spitzmüller via lyx-users:
>> Am Montag, dem 14.02.2022 um 09:50 +0100 schrieb Wolfgang Engelmann via
>> lyx-users:
>>> How should I try to find out whats going oß
>>
>> We need to see this file.
>>
>> Jürgen
>>
>>
> This is my attempt to find out what is going on:
> 
> wolfgang at Fuji:/tmp$ ls lyx*
> lyx_tmpdir.vblaVyVPIGKk:
> Buffer_convertLyXFormatLIfocI.lyx  lyx_tmpbuf0  lyx_tmpbuf2
> Buffer_convertLyXFormatYEHRwL.lyx  lyx_tmpbuf1  lyx_tmpbuf3
> 
> lyx_tmpdir.ZZlQmEsDQdUW:
> lyxsocket  lyx_tmpbuf0  lyx_tmpbuf1
> wolfgang at Fuji:/tmp$ ls lyx_tmpdir.AD* >>>1st one
> ls: Zugriff auf 'lyx_tmpdir.AD*' nicht möglich: Datei oder Verzeichnis 
> nicht gefunden
> wolfgang at Fuji:/tmp$ ls lyx_tmpdir.cd*
> ls: Zugriff auf 'lyx_tmpdir.cd*' nicht möglich: Datei oder Verzeichnis 
> nicht gefunden
> wolfgang at Fuji:/tmp$ ls lyx_tmpdir.vbl*
> Buffer_convertLyXFormatLIfocI.lyx  lyx_tmpbuf0  lyx_tmpbuf2
> Buffer_convertLyXFormatYEHRwL.lyx  lyx_tmpbuf1  lyx_tmpbuf3
> 
> Why are the buffer files of lyx shown, but tells they are not found?
> The newest one is the first  (marked >>>1st one)kwrite
> the older one are below it
> 
> If I click on the
> Buffer_convertLyXFormatLIfocI.lyx  lyx_tmpbuf0  lyx_tmpbuf2
> lyx opens but:
> 
> Das Dokument /tmp/lyx_tmpdir.vblaVyVPIGKk/master.lyx existiert noch nicht.
> 
> I can open it, however, with a text editor (kwrite)
> 
> All very strange and confusing for me.
> 
> Wolfgang

by the way, I have lyx 2.4.0-alpha3 in /usr/local/bin (Debian)

and lyx 2.3.1 in /usr/share

typing lyx starts 2.4.0-alpha3

since I can't work with lyx at the time being, I would like to go back 
to 2.3.1.
How would I do that and from where can I use the lyx2lyx conversion tool 
to convert my latest lyx files back into .23?

Wolfgang